Every home's heating and cooling setup tells a different story, and every commercial property has its own demands. A single-family home in Old Greenwich with a decades-old boiler has different needs than a restaurant on Greenwich Avenue running commercial rooftop units. We handle both, and everything in between.
We treat your home and its system the way we would our own. That means careful diagnostics, honest recommendations, and work performed by qualified HVAC technicians who take the job seriously from start to finish.
Our services cover the full range of residential and commercial heating and cooling needs:
Whether you need a quick repair or a full system replacement, we bring the same level of care to every job.
You shouldn't have to chase a contractor for answers, and you shouldn't have to wonder whether the person who picks up the phone knows your neighborhood. We've been rooted in Greenwich since 1983, when the business was built on a straightforward idea: do good work, be honest with people, and show up when you say you will.
That reputation has grown the way good reputations do. It's the kind of HVAC work neighbors pass along by word of mouth, a referral from a friend on the next street, a property manager who's used us for years and keeps calling back. We've worked in homes across Greenwich and throughout the Western Connecticut Planning Region, from older colonial-style houses with original ductwork to newer construction with modern zoned systems.
We answer our own phones and drive our own trucks. When you call us, you reach someone who knows the area, knows the work, and can get a technician to your door. We serve homeowners, landlords, property managers, and business owners, and we bring the same straightforward approach to every one of them.
Give us a call and we'll get the comfort back.
The sooner you call, the sooner your comfort is back, and that matters most when your heat goes out on a cold January night or your AC stops working in the middle of a summer heat stretch. We're available around the clock for HVAC emergencies, because a system failure doesn't wait for business hours.
We take pride in the HVAC work we leave behind, and that starts with how we respond when you need us most. When you call with a no-heat or no-cool emergency, a real person picks up, a technician gets dispatched, and the problem gets diagnosed so you know exactly what's happening and what it will take to fix it. We handle residential emergencies for homeowners and commercial emergencies for businesses where a system going down means real disruption for employees and customers.
Whether it's a furnace that stopped working overnight, an AC unit that quit on the hottest day of the year, or a heat pump that's cycling without producing any comfort, we're ready to respond.
Quick to arrive. Careful with your home. Tidy when we leave.
One of the most common frustrations people have with contractors is not knowing what something will cost until the bill arrives. We work differently. Before any work begins, we assess the system, explain what we found, and give you a clear quote. You know what you're approving before we pick up a tool.
That approach applies whether we're diagnosing a refrigerant leak, troubleshooting airflow and uneven temperatures across a home, replacing a condenser or compressor, or quoting a full system replacement. Small repair or major installation, the process is the same: look at the system, tell you what it needs, give you a number, and get your approval.
We also won't push you toward a replacement when a repair makes sense, or talk you into a repair when the honest answer is that the system has run its course. Energy-efficiency upgrades and system replacements are conversations we have when they're genuinely the right call for your situation.
Give us a ring and we'll take care of it.
When your air conditioner isn't cooling the way it should, is blowing warm air, making unusual noises, or showing signs of a refrigerant leak, we diagnose the problem and tell you what it will take to fix it. Our technicians handle condenser and compressor service, evaporator coil cleaning and repair, refrigerant leak diagnosis and correction, and full AC replacement when the system has reached the end of its useful life. We also offer seasonal tune-ups so your system is ready before the first hot day of the year. A maintenance visit gives us a chance to catch small issues before they become expensive ones.
Connecticut winters are serious, and a furnace that stops working or starts blowing cold air is not something you can put off. We handle furnace repairs across a wide range of makes and models: furnaces that won't ignite, systems that run but don't heat, furnaces making banging or rattling sounds, and situations where there's simply no heat in the house. We also do pre-season furnace inspections so you're not finding out about a problem on the first cold night of the season. When a furnace has run its course and repair no longer makes sense, we'll walk you through replacement options and give you a clear quote before any work starts.
Heat pumps have become an increasingly popular choice in this region, offering efficient heating and cooling from a single system. We service and install heat pumps of all types, including repairs when a heat pump isn't heating or cooling properly and full installations for homes making the switch from older equipment. Ductless mini-splits are a strong fit for homes without existing ductwork, room additions, or spaces where zoning and comfort-control matter. We install and service ductless systems throughout Greenwich and handle airflow and uneven-temperature troubleshooting for homes where some rooms never seem to get comfortable.
Leaky or damaged ductwork can quietly undermine an otherwise well-functioning HVAC system. We repair and seal ductwork to restore efficiency and even out temperatures across the home. Smart thermostat installation and setup is a straightforward upgrade that gives you better control over your system and can improve efficiency without a major investment. For homeowners concerned about what's in the air, we install indoor air quality and air filtration systems, including air purifiers and whole-home humidifiers, that work alongside your existing heating and cooling equipment.
Businesses can't afford long downtime when a heating or cooling system fails. Employees get uncomfortable, customers notice, and in some settings, like restaurants and retail spaces, a system failure has real operational consequences. We've been handling commercial HVAC work in Greenwich for decades, and we understand what's at stake when a business property needs service.
We handle commercial AC repair, commercial heating repair, and full system installation and replacement for offices, retail spaces, restaurants, and other commercial properties. Our approach to commercial work is the same as residential: assess the system, explain the findings, give a clear quote, and get the work done right. Preventive maintenance is something we recommend for commercial clients because it catches problems before they become emergencies, and code-compliant HVAC work is something we take seriously on every commercial job.
We'll get your home comfortable again fast, and your business back to normal just as quickly.
We're based in Greenwich and serve the surrounding communities throughout the Western Connecticut Planning Region. Our service area includes:
If you're in Greenwich or a nearby town and need heating or cooling service, chances are we've already worked in your neighborhood.
We have been working in Greenwich since 1983, which means we know the housing stock, the equipment common to this area, and the kinds of problems that show up year after year in older Connecticut homes. That local experience shapes how we diagnose and approach every job. We are locally owned and operated HVAC technicians, accountable to the same community we live and work in.
All work is performed by qualified HVAC technicians who know the equipment common to this part of Connecticut. We are a locally owned and operated business, and the people we send to your home are the same technicians who have been doing this work in and around Greenwich for years. We do not subcontract to unfamiliar crews.
We stand behind the work we do. If a problem we addressed comes back, call us and we will come back out to look at it. We take pride in the HVAC work we leave behind, and that means making it right if something does not hold up the way it should.
Yes. We treat your home with the same care we would want shown in our own, and that includes how our technicians present themselves and how they handle your property during the visit. We are tidy when we leave.
We diagnose first and recommend only what the system actually needs. We will not push you toward a replacement when a repair makes sense, and we will not recommend add-on work that does not address the problem you called about. A straight answer before any work begins is part of how we operate.
We walk you through what we found before we start, and we check in if anything changes once we are into the work. You will know what we are doing and why at every step. By the time we are done, there are no surprises on the invoice and no questions left unanswered about what was done.
Being locally owned means the people answering the phone and showing up at your door are personally accountable to the community. We have built our reputation in Greenwich over more than four decades through the kind of HVAC work neighbors pass along by word of mouth. That reputation matters to us, and it shapes how we treat every job.
For more than 43 years, Kaiser Heating & A/C has been the heating and cooling company Greenwich homeowners and businesses trust to get the job done right. Locally owned, personally accountable, and ready to help today, we're a call away whenever your system needs attention.
Whether you're dealing with an emergency, planning a seasonal tune-up, or looking to replace an aging system, reach out and we'll get a technician to you.
Call us at (475) 239-2878 to schedule service or request a quote.
Call today. Comfortable tomorrow. Running for good.
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