Kaiser Heating & A/C has been serving Greenwich and the surrounding Western Connecticut communities since 1983. For over 40 years, we have handled the full range of residential and commercial heating and cooling work: AC repair and service, furnace and heating repair, heat pump service and installation, boiler work, ductless mini-split systems, ductwork, thermostats, indoor air quality, and emergency HVAC service when your system goes down at the worst possible time.
We answer our own phones and drive our own trucks. When you call, you reach someone who knows Greenwich, knows the equipment common to this area, and can get a qualified technician to your door without the runaround. We work with homeowners, landlords, property managers, and commercial clients across the region.
Real technicians. Real pricing. Real fast response.
Whether you need a quick repair, a full system replacement, or a seasonal tune-up before the weather turns, call us at (475) 239-2878 for a quote.
Over the years, we have seen every kind of furnace, AC, and heat pump that Connecticut homes and businesses run. We work on all of it, and we work on it fast. Whether your system stopped working overnight, is blowing warm air in August, or is making a noise that was not there last week, we diagnose the problem and fix it right.
We are locally owned and operated HVAC technicians, and that means we are accountable to the same neighbors we serve every day.
When your air conditioner stops cooling, the cause could be a refrigerant leak, a frozen evaporator coil, a failing condenser, or an airflow problem that has been building for months. We diagnose no-cool calls from the ground up: checking refrigerant charge, inspecting coils, testing the compressor and capacitors, and tracing airflow issues back to their source. If your AC stopped working, is blowing warm air, or keeps short cycling, call us at (475) 239-2878 and we will get it looked at fast.
A furnace that will not fire on a cold January morning is not something you want to wait on. We handle no-heat calls for gas and oil furnaces, inspect heat exchangers, service blower motors, and work through the full diagnostic when your furnace is blowing cold air or will not start at all. We treat your home and its system the way we would our own, which means we do not cut corners and we explain what we found before we start the work.
Heat pumps are increasingly common in Connecticut, and for good reason. They handle both heating and cooling efficiently through the shoulder seasons that define spring and fall here. When a heat pump is not heating, not cooling, or short cycling, the issue is often refrigerant, a reversing valve, or a control board. We diagnose and repair all of it, and we install new heat pump systems for homeowners and commercial clients looking to make the switch.
When repair is no longer the right answer, we handle full HVAC system replacement and new central air installation. We size equipment to the building, not to what happens to be in stock, and we walk you through equipment options before anything gets ordered. We serve both residential and commercial clients, from single-family homes to small office buildings and multi-unit properties. Give us a ring and we will take care of it.
Greenwich sits in a part of Connecticut where the housing stock tells the whole story of New England heating. Older homes with boilers and radiators, oil tanks in basements, and rooms added over decades without any ductwork at all. The winters are cold enough to demand a reliable heating system, and the humid summers make cooling just as important. The three services below come up constantly in this area, and we have built real depth in all of them.
Many Greenwich homes run on hot-water or steam boiler systems, some of them decades old and still doing their job when they are properly maintained. We repair, service, and replace boilers, and we work through the full hydronic system: zone valves, circulators, expansion tanks, and baseboard or radiator distribution. If your boiler is not working, you have no heat, or the heat is uneven from room to room, that is a call we handle every week. The kind of HVAC work neighbors pass along by word of mouth is exactly this: showing up, knowing the equipment, and leaving the system running better than we found it.
Western Connecticut has one of the highest concentrations of oil-heated homes in the country. The Northeast holds roughly 79 percent of US oil-heat households, and Connecticut is squarely in that picture. As oil prices climb and cleaner alternatives become more practical, many homeowners and property managers are making the move to gas or heat pump systems. We handle the equipment side of that transition: removing the old oil-fired unit, selecting and installing the replacement furnace, boiler, or heat pump, and commissioning the new system for efficiency and comfort. The gas-line work belongs to a licensed plumber, but the heating equipment is our side of the job, and we coordinate the transition so it goes smoothly.
Older Greenwich homes, carriage houses, finished basements, historic properties, and room additions often have no ductwork at all. Running new duct through an older structure is expensive and sometimes not practical. Ductless mini-split systems solve that problem cleanly: a small outdoor unit connects to one or more indoor air handlers, delivering both heating and cooling without touching the existing structure. We install single-zone and multi-zone ductless systems, and we service and repair them when they stop cooling, stop heating, or throw an error code. We will get your home comfortable again fast.
Every home's heating and cooling setup tells a different story, and the equipment is only part of it. Leaky ducts, an outdated thermostat, or poor air quality can undercut even a well-maintained system. We handle the supporting work that makes the whole thing perform the way it should.
Leaky ductwork is one of the most common causes of uneven temperatures, high energy bills, and rooms that never quite reach the right temperature. We locate leaks, seal duct connections, repair damaged sections, and balance airflow across the system. If some rooms run hot while others run cold, or your energy bills have crept up without explanation, ductwork is often where the answer is.
A thermostat that is not reading correctly, not communicating with the system, or simply too old to do its job can cause all kinds of comfort problems. We install standard and smart thermostats, set them up for your system, and make sure the controls match how you actually use your home. If your HVAC is not responding, not turning on, or running at the wrong times, a thermostat swap is sometimes the fastest fix on the list.
Tightly sealed Connecticut homes hold onto dust, allergens, and stale air more than older, draftier construction. We install whole-home air filtration systems, air purifiers, and humidity management equipment that work with your existing HVAC system to keep the air inside cleaner and more comfortable. If anyone in the household deals with allergies, asthma, or general air quality concerns, it is worth a conversation.
The sooner you call, the sooner your comfort is back, and that is exactly why we keep technicians available for emergency and same-day service. No heat in the house, no air conditioning in the middle of a heat wave, or an HVAC system that went down completely: these are not situations where waiting until next week is an option.
We respond to emergency calls for both residential and commercial clients. Property managers and landlords know that a heating failure in a rental unit is a habitability issue, not just an inconvenience. We take those calls seriously and move fast.
Quick to arrive. Careful with your home. Tidy when we leave.
We take pride in the HVAC work we leave behind, and that applies just as much to an emergency call at 7 PM as it does to a scheduled tune-up. Call (475) 239-2878 now and tell us what is happening.
We work with the full range of clients in and around Greenwich. On the residential side, that means single-family homeowners, historic properties, older homes with unusual heating setups, and new construction. We are comfortable with all of it.
On the commercial side, we serve small offices, retail spaces, multi-unit residential buildings, and property management accounts that need a reliable HVAC contractor they can call without explaining the building from scratch every time. Rental property owners especially value fast turnaround: a tenant without heat or AC is a problem that cannot wait, and we treat it that way. Give us a call and we will get the comfort back.
We have been doing this work in Greenwich since 1983. That is over 40 years of boilers, heat pumps, AC systems, and furnaces in this area, and the relationships that come with showing up and doing good work year after year.
All work is performed by qualified HVAC technicians who know the equipment common to this part of Connecticut. We are locally owned and operated HVAC technicians, accountable to the community we live and work in.
We serve Greenwich and the communities around it, including Cos Cob, Old Greenwich, Riverside, Byram, Glenville, Stamford, Darien, New Canaan, and the Port Chester and Rye areas across the state line. If you are in the Western Connecticut region and need heating or cooling work done right, we are the team to call.
We are based in Greenwich and serve customers throughout the surrounding area. Our service territory includes:
We cover the wider Western Connecticut and Fairfield County region. If you are nearby and not sure whether we come to you, call (475) 239-2878 and ask.
A tune-up before the season starts is the most reliable way to avoid an emergency call in the middle of it. We inspect, clean, and performance-test both AC systems in the spring and heating systems in the fall, checking refrigerant levels, testing controls, inspecting heat exchangers, and catching worn components before they cause a failure. Heat pump maintenance is a year-round consideration since the system runs in both directions. Most problems we find during a maintenance visit are small and inexpensive to fix. The ones we catch before they become failures are the ones that save you the most. We will get your home comfortable again fast.
An HVAC emergency is any situation where your heating or cooling system has stopped working entirely, including no heat in winter, no air conditioning during a heat stretch, or a system that shut down without warning. We offer same-day and emergency dispatch for both residential and commercial customers. Call (475) 239-2878 and we will get a technician moving as quickly as possible.
Many homes in Greenwich and throughout Fairfield County run on hot-water or steam boiler systems, some of them decades old. We work through the full hydronic loop: the boiler unit itself, zone valves, circulators, expansion tanks, and baseboard or radiator distribution. If your boiler is not heating, is heating unevenly, or is making unusual sounds, we diagnose the full system and give you a clear quote on the repair or replacement before any work starts.
We handle the equipment side of the transition: removing the existing oil-fired unit, selecting the right replacement furnace, boiler, or heat pump for the home, and installing and commissioning the new system. The gas-line work belongs to a licensed plumber, but we coordinate the transition so the heating equipment side goes smoothly and the new system is set up correctly from day one.
Many older Greenwich homes, carriage houses, finished basements, and historic properties have no ductwork at all, or have rooms added over the years that were never connected to the central system. Running new duct through an older structure is often expensive and disruptive. A ductless mini-split delivers both heating and cooling through a small outdoor unit and one or more indoor air handlers, without touching the existing structure.
A frozen coil or restricted airflow often presents as an AC that runs constantly but never cools the space down, or blows air that feels cool at the vent but cannot keep up with the temperature. The root cause could be a dirty filter, a refrigerant issue, a blocked return, or a failing blower. We trace the problem to its source rather than addressing only the symptom.
Leaky ducts allow conditioned air to escape before it reaches the living space, which means the system runs longer and works harder to hit the set temperature. Undersized ducts restrict airflow and create pressure imbalances that leave some rooms too hot or too cold. We locate leaks, seal duct connections, and repair damaged sections to restore efficiency and even out temperatures across the home.
We inspect the system first, run through a full diagnostic, and identify the cause of the problem. From there, we explain what we found and what it will take to fix it, and we give you a clear quote before any work begins. We do not start work until you have approved the scope and the price.
Yes. We document what we found, what we did, and how the system tested out before we left. You will have a clear record of the work performed, which is useful for warranty purposes and for tracking your system's service history over time.
We run the system through its normal operating cycle after completing any repair or installation. For heating work, that means confirming the system fires, reaches temperature, and distributes heat correctly. For cooling work, we verify refrigerant charge, airflow, and that the system is pulling the space down to the set temperature. We do not close out a job until the system is performing the way it should.
For most repairs and all installations, yes, we de-energize the equipment before working on it. This is standard practice for safe HVAC work. We handle that as part of the job. If there are any steps you need to take on your end, we will let you know before we start.
A pre-season inspection before the heating season starts and before the first hot stretch of summer are the two most practical times. We also recommend an inspection when you are buying or selling a property, when a system has not been serviced in several years, or when you are noticing higher energy bills without an obvious cause.
Kaiser Heating & A/C is ready to help with everything from a quick repair to a full system replacement, a seasonal tune-up to an emergency no-heat call. We have been serving Greenwich and the surrounding Western Connecticut communities for over 40 years, and we stand behind every job we do.
Call today. Comfortable tomorrow. Running for good.
Call (475) 239-2878 to get a quote or schedule service. We are here when you need us.
We handle the full range of heating and cooling work for Greenwich homes and businesses, from a quick same-day repair to a complete system replacement. Whether your system is acting up in the middle of winter or you are planning an upgrade before the summer heat arrives, our qualified HVAC technicians are ready to help. Every job starts with a clear quote so you know what to expect before any work begins. Browse the services below to find what fits your situation, then call us for personalized advice.
| System Service | What's Included | Common Needs | Helpful Details |
|---|---|---|---|
| Window-AC-to-Mini-Split Retrofit | removal of window AC unitsductless mini-split installation in place of window unitsmulti-room retrofit planningyear-round heating and cooling upgrade | homeowners ready to move away from window units and into a cleaner, quieter, year-round solution | Mini-splits provide both heating and cooling, so a retrofit eliminates the seasonal swap of window units and improves comfort in every season |
| Thermostat Installation and Smart Controls | programmable thermostat installationsmart thermostat setupzoning control upgradeslow-voltage wiring on HVAC equipment | homeowners looking to improve comfort, reduce energy use, or gain better control over their system | A smart thermostat upgrade is one of the simpler improvements that can make a real difference in day-to-day comfort and monthly operating costs |
| Ductless Mini-Split Installation | single-zone mini-split installationmulti-zone mini-split systemsheating and cooling in one unitretrofit for rooms without ductwork | older homes with additions, sunrooms, or finished spaces that were never connected to central ductwork | Mini-splits deliver both heating and cooling without opening walls or ceilings, making them a practical solution for spaces that have always been uncomfortable |
| Emergency HVAC Service | same-day dispatch for no-heat callssame-day dispatch for no-cool callsafter-hours emergency responserapid system diagnosis | any situation where heat or cooling has failed and waiting is not an option | We keep availability open for emergency calls so residential and commercial customers in the area can reach us when it matters most |
| Full System Installation and ReplacementMost Popular | central AC installationfurnace installation and replacementheat pump system installationequipment sizing and selection | homeowners or property managers replacing an aging system or upgrading to more efficient equipment | A properly sized and installed system runs more efficiently and lasts longer; we walk you through your options and give you a clear quote before any work begins |
| AC Repair and Service | refrigerant leak diagnosisairflow and cooling troubleshootingcapacitor and contactor repaircondenser and evaporator coil service | homeowners or businesses with an AC that is not cooling, cycling oddly, or making noise | Catching a small refrigerant or airflow issue early almost always costs less than waiting until the system quits entirely |
| Heat Pump Repair and Service | short-cycle diagnosisrefrigerant charge checkreversing valve inspectiondefrost cycle troubleshooting | homes running a heat pump as their primary heating and cooling source | Heat pumps work year-round, so regular service matters in both seasons, not just before winter |
| Indoor Air Quality and Air Filtration | whole-home air purifier installationUV air purifier and air scrubber installationwhole-home humidifier installationfiltration system service and replacement | households concerned about allergens, dust, humidity, or overall air quality year-round | Connecticut winters can dry indoor air significantly; a whole-home humidifier paired with a quality filtration system addresses both comfort and air quality at once |
| Seasonal Maintenance and Tune-Ups | furnace or boiler pre-season inspectionAC pre-season tune-upfilter and belt checksfull system performance test | homeowners and property managers who want to catch issues before they become breakdowns | Scheduling a tune-up before the heating or cooling season starts means fewer surprises when the weather turns and the system runs hardest |
| Ductwork Repair and Sealing | duct leak detectionduct sealing and patchingairflow balancingsupply and return duct repair | homes with uneven temperatures, high energy bills, or reduced airflow from vents | Leaky ducts can account for a significant share of heating and cooling loss; sealed ducts help the whole system perform the way it was designed to |
| Boiler and Hydronic Heating Service | hot-water boiler repair and replacementsteam system servicebaseboard and zone troubleshootingseasonal boiler tune-up | older Greenwich and Fairfield County homes running cast-iron radiators, steam systems, or baseboard hot-water heat | Hydronic systems require technicians who understand the full loop from the boiler to the radiators; forced-air experience alone is not enough for these setups |
| Heating and Furnace Repair | furnace diagnostic and repairheat exchanger inspectionigniter and burner serviceblower motor troubleshooting | any home or building that has lost heat or is seeing uneven temperatures in cold weather | Older furnaces in Greenwich homes often develop igniter or heat-exchanger issues as they age; a prompt diagnosis keeps a small problem from becoming a full outage |
| Oil-to-Gas and Heat Pump Conversion | oil furnace and boiler replacementgas equipment installationheat pump conversion assessmentequipment selection for older homes | Greenwich homeowners with aging oil-fired equipment who are evaluating their next heating system | Connecticut has a high share of oil-heat homes, and many systems are reaching the end of their useful life; we focus on the equipment and installation so you get a modern, efficient system matched to your home |
How do I know whether my system needs a repair or a full replacement?
Age, repair history, and current performance all factor into that decision. A system that is 15 to 20 years old, has needed multiple repairs in recent seasons, or is struggling to maintain comfortable temperatures is worth a close look. We inspect the system, give you our honest read on its condition, and help you weigh the cost of continued repairs against a replacement. We will not push you toward a new system if a repair genuinely makes sense.
What are the signs that my AC or furnace is close to failing?
For an AC, watch for rising energy bills without a change in usage, warm air from the vents, ice forming on the unit, or a system that runs constantly without reaching the set temperature. For a furnace, signs include short cycling, cold spots in the house, unusual noises, or a pilot or igniter that fails to light. Any of these is worth a call before the system quits entirely.
Why is one room in my home always hotter or colder than the rest?
Uneven temperatures usually point to a duct leak, a blocked or undersized supply run, an airflow imbalance, or a zoning issue. In older homes, it can also mean the original duct layout was never sized correctly for the current system. We diagnose the cause and give you a straight answer on what it will take to fix it.
Same-Day and Emergency Availability
We keep our schedule open for urgent calls so residential and commercial customers across Greenwich and the surrounding area can reach us when heat or cooling fails. Call us and we will get someone out fast.
How often should I schedule a maintenance tune-up?
Once a year is the baseline for most systems. If you run a heat pump year-round, a tune-up before each season, fall and spring, keeps both the heating and cooling sides in good shape. Regular maintenance catches small issues before they become breakdowns and helps the system run efficiently through the season.
What does a seasonal tune-up actually cover?
A thorough tune-up includes inspecting and cleaning the heat exchanger or evaporator and condenser coils, checking refrigerant charge, testing electrical connections and controls, inspecting the blower or fan, verifying thermostat operation, and running the system through a full performance check. The goal is to find anything that could cause a problem before the season starts.
What causes a system to short-cycle?
Short cycling, where the system turns on and off too quickly without completing a full heating or cooling cycle, usually points to an oversized unit, a refrigerant issue, a dirty filter or coil restricting airflow, or a failing component like a capacitor or pressure switch. It puts extra wear on the equipment and makes it harder to maintain a consistent temperature. A technician can diagnose the cause and tell you what the fix involves.
Upfront Quotes With No Surprise Fees
We give you a clear quote before any work begins, and that is the price you pay. No charges are added after the fact, and no work starts until you approve it.
Can I get same-day service if my heat or AC goes out?
Yes. We keep availability open for same-day and emergency calls for both residential and commercial customers across Greenwich and the surrounding area. When heat or cooling fails, call us and we will get a technician out as fast as possible. The sooner you call, the sooner we can get to you.
Do I need to be home when the technician arrives?
For most repair and service calls, yes, someone should be present so the technician can access the equipment and walk you through the findings before any work begins. For some commercial or multi-unit properties where access is arranged in advance, we can work with a property manager or building contact. Just let us know your situation when you call.
Experienced With Older and Newer Systems
From cast-iron steam boilers and oil-fired furnaces in older Greenwich homes to modern heat pumps and ductless mini-splits, our technicians work on the full range of equipment you are likely to find in this area.
How does your pricing and quoting process work?
We assess the system, explain what we found, and give you a clear quote before any work begins. You approve the price before we pick up a tool, and that is the price you pay. There are no charges added after the fact. If the scope of work changes once we are into the job, we talk to you first.
What do strange noises from my HVAC system usually mean?
Banging or clanking often points to a loose or broken component inside the unit. A high-pitched squeal can mean a worn belt or bearing. Rattling sometimes indicates a loose panel or debris in the system. Clicking at startup is normal, but clicking that continues through operation can signal a control or relay issue. Any noise that is new or getting worse is worth a call before it leads to a larger failure.
Is older equipment worth repairing, or does it make more sense to replace it?
It depends on the age of the system, the cost of the repair, and how the equipment has been performing. A relatively minor repair on a system that is otherwise in good shape and under 15 years old usually makes sense. When repair costs start approaching a significant share of replacement cost, or when the system has needed repeated work over recent seasons, replacement is often the better value. We give you an honest assessment either way.
Every situation is a little different, so call us at (475) 239-2878 and we will give you a straight answer on what your system needs and what it will cost.
(475) 239-2878