Kaiser Heating & A/C has been the go-to heating and cooling company for Greenwich homes and businesses since 1983. We handle the full range of HVAC work: AC repair and service, heating repair, heat pump service, and complete system installation and replacement. Whether you own a single-family home, manage a rental property, or run a commercial building, we show up ready to work and ready to answer your questions.
We answer our own phones and drive our own trucks. When you call, you reach a locally owned and operated HVAC technician who knows this area and can get to you fast. Same-day availability and emergency service are part of how we operate, not an upsell.
Real technicians. Real pricing. Real fast response.
Call (475) 239-2878 for a quote.
Every home's heating and cooling setup tells a different story, and we have heard most of them in our 43 years of work across Greenwich and the surrounding area. AC not working on a July afternoon. A furnace blowing cold air in February. A heat pump short cycling and never quite reaching the set temperature. These are the calls we take every day.
Our technicians diagnose the problem correctly the first time. Whether your system is making a loud noise, losing airflow, leaking, or just not keeping up, we trace the issue to its source and give you a straight answer before any work begins. We treat your home and its system the way we would our own.
We handle AC repair, heating repair, furnace repair, and heat pump repair for both residential and commercial customers. Uneven heating and cooling, airflow problems, and emergency no-heat or no-cool situations are all in our wheelhouse. Give us a call and we'll get the comfort back.
The sooner you call, the sooner your comfort is back, and we keep our schedule open for exactly that reason. When the heat goes out in the middle of a cold Connecticut night, or the AC stops working before a busy weekend at your restaurant or office, waiting a week is not an option.
We offer same-day dispatch and emergency HVAC service for residential and commercial customers across the area. No heat in the house, AC down at your business, a system that quit without warning: call us and we will get someone out fast.
Quick to arrive. Careful with your home. Tidy when we leave.
We have built a reputation for the kind of HVAC work neighbors pass along by word of mouth, and that starts with showing up when it matters most. Call (475) 239-2878 to reach us today.
Over the years, we've seen every kind of furnace, AC, and heat pump, and we have installed or replaced most of them. When a repair no longer makes sense, or when a system has reached the end of its useful life, we walk you through your replacement options clearly and help you choose the right equipment for your home or building.
We handle full HVAC system installation and replacement, central air installation, furnace installation and replacement, heat pump installation, and AC unit replacement for both residential and commercial properties. New systems run more efficiently, keep temperatures more consistent, and cost less to operate month to month.
We take pride in the HVAC work we leave behind. Before any installation begins, we give you a clear quote so you know exactly what to expect. Call (475) 239-2878 and we will get started. We'll get your home comfortable again fast.
Greenwich and the surrounding Western Connecticut region have specific heating and cooling demands that shape the work we do most. Cold winters, humid summers, and a large share of older homes with aging heating systems mean certain services come up again and again. The three below represent some of the most common calls we handle in this area.
Many older homes and commercial buildings in Greenwich and throughout Fairfield County run on hot-water boilers connected to baseboard radiators or cast-iron steam systems. These setups are reliable when properly maintained, but they need technicians who understand hydronic systems, not just forced-air equipment. We service, repair, and replace boilers of all types, handle seasonal tune-ups, and troubleshoot the full hydronic loop from the unit to the radiators. If your boiler is not working, making noise, or failing to heat certain zones, call us for a diagnosis and a straight quote on the repair or replacement.
The Northeast holds a disproportionate share of the country's oil-heat homes, and Connecticut is no exception. Many Greenwich properties still run on oil-fired boilers or furnaces that are aging out. When it is time to replace the heating unit, we help homeowners and property managers evaluate their options: a new oil system, a switch to gas equipment, or a heat pump that handles both heating and cooling in one unit. We focus on the equipment itself and the installation. The result is a modern, efficient heating system matched to your home and your priorities. Call for a quote and we will walk you through what makes sense for your setup.
Older Greenwich homes often have rooms, additions, sunrooms, or finished spaces that were never connected to central ductwork. Running new duct to those areas is expensive and disruptive. A ductless mini-split system solves the problem cleanly: one outdoor unit connects to one or more indoor air handlers, delivering both heating and cooling without tearing into walls or ceilings. We install, repair, and replace mini-split systems for residential and commercial customers. If you have a room that is always too hot in summer or too cold in winter, a mini-split is often the right answer. Give us a ring and we'll take care of it.
You shouldn't have to chase a contractor for answers, and you shouldn't need three different companies to handle your HVAC work. Here is a full look at what we do:
Every service comes with a clear quote before work begins. We'll get your home comfortable again fast.
We started this business in 1983, and we have been serving Greenwich and the surrounding Western Connecticut area ever since. Four decades of work in this community means we know the housing stock, the climate, and the kinds of heating and cooling problems that show up year after year.
We work with residential homeowners, landlords, property managers, and commercial businesses. Whether you need a quick repair or a full system replacement, you get the same straightforward service and the same honest pricing. Qualified HVAC technicians handle every job, and we stand behind the work we do.
We serve customers across Greenwich and the nearby communities of Stamford, Darien, New Canaan, Cos Cob, Old Greenwich, Riverside, Byram, and Port Chester. If you are in the area and need heating or cooling help, we are close by and ready to come out.
Greenwich is our home base, and we serve residential and commercial customers throughout Fairfield County and the Western Connecticut region. Our service area includes:
If you are nearby and need HVAC service, call us. We know the area and we can get to you quickly.
Call us at (475) 239-2878 and tell us what your system is doing. We will ask a few quick questions, check our schedule, and get a technician dispatched as fast as possible. Same-day availability is part of how we operate, so the sooner you call, the sooner we can get to you.
Yes. We work with homeowners, landlords, property managers, and commercial clients across Greenwich and the surrounding Western Connecticut area. Whether you run a small office, a retail space, or a multi-unit residential building, we handle the same full range of heating and cooling work we do for residential customers.
No. 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 surprise charges added after the fact.
When you call, we gather some basic information about your system and the problem you are seeing. A technician arrives, inspects the equipment, diagnoses the issue, and walks you through what it will take to fix it. Once you approve the quote, we do the work and test the system before we leave.
Yes. We operate every day from 7:00 AM to 10:00 PM, including Saturdays and Sundays. Heating and cooling problems do not stick to a Monday-through-Friday schedule, and neither do we.
When a system is failing repeatedly, repair costs can add up quickly and the reliability problems do not go away. We will give you an honest assessment of whether continued repair makes financial sense or whether a replacement is the better call for your situation. We will not push you toward a new system if a repair is genuinely the right answer, and we will not keep patching something that has run its course.
Age, repair history, and current performance all factor in. 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 can inspect the system, give you our honest read on its condition, and help you weigh the cost of continued repairs against a replacement.
For non-emergency work, we can often get to you within a day or two. For same-day and emergency calls, we keep availability open so we can respond quickly. Call us at (475) 239-2878 and we will give you a realistic timeframe based on current schedule.
We serve Greenwich and the surrounding communities throughout Fairfield County and the Western Connecticut region, including Stamford, Darien, New Canaan, and nearby areas. Call us at (475) 239-2878 and let us know your location. We will confirm coverage and any applicable service-area details before scheduling.
Whether you need a same-day repair, a new system installation, or a seasonal tune-up, Kaiser Heating & A/C is ready to help. We give you a clear quote before any work begins, show up on time, and get the job done right.
Call today. Comfortable tomorrow. Running for good.
Call (475) 239-2878 and let's get started.
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