340 Quinnipiac Street / Building 33
Wallingford, CT 06942
203-815-6851

Local Reviews

Rated 5.0 out of 5 stars based on 558 customer reviews

EXCELLANT service

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These guys are great!

Not only are we customers, but I referred my son to them when he found himself without heat They responded quickly and were able to fix the problem right away for him

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Terrific service

Terrific service. He went above and beyond in servicing my furnace.

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excellent service

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Excellent Service

Larry was very kind, knowledgeable, and friendly!

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Excellent service

Thorough on time and explain the the results of the cleaning. Carried himself professionally, took the time to explained everything.👍

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Excellent

There’s no better than X-TREME. Had my furnace serviced/cleaned today and I can honestly say the technicians were fantastic! They did a great job and explained to me in detail when I had a question. This is my third year doing my annual furnace cleaning I had other companies in the past but they didn’t compare. So glad found X-TREME

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Excellent service

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Great guy, informative and professional.

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Excellent Service

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Great job!

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Excellent Service!

I purchased my new HVAC system from Larry Halpin in 2018 and I have had them service my system each year. They are always very helpful whenever I call to set up my annual appointment.

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Excellent Service

Andrew is a very knowledgeable person and is very professional when he comes to our home to service our heating and cooling systems.

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Great service at a reasonable price

Fantastic service at a reasonable cost. The tec. Reviewed everything he did I was very satisfied and highly recommend Extreme to my family and friends.

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Always accommodating

We love the whole crew! Highly recommended

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Job Locations

Larry H.

Larry H. Job Checkin

The system was on and running when arrived. Checked the oil flow and transformer, both are ok. When the zones were calling for heat, the circulators were making a whooshing sound. Noticed the pressure gauge was reading 5 psi, lifted the handle on the automatic water feed and it added water to the system and stopped at 20 psi. With pressure in the system, the noise went away and temperature in the boiler started to drop. There was not enough water in the system to push the water to the 2nd floor. System is operating properly.


Larry H.

Larry H. Job Checkin

The water heater was off on reset. Reset the control and it started properly, when the furnace turned on, the water heater was loosing oil flow and shutting off. Blew out the oil line going to the u der ground tank. Primed the oil line. Turned the furnace on then the water heater, the water heater was reading 420 ohms and staying steady for 8 minutes while the furnace was on. System is operating properly.


Larry H.

Larry H. Job Checkin

Burner was off on reset. Reset the control and it started. Checked the ohms, the cad cell was reading 1300 ohms which will cause it to go off on reset. Adjusted the cadcell eye and it was reading 540 ohms. Installed a used Beckett primary control to see history and ohms. While the water heater was running, the furnace turned on and 10 seconds later the water heater went off on reset. Replaced the oil filter at the wall. Started and checked operation. It was still doing the same thing. After the furnace was satisfied, checked the oil flow at the water heater and noticed a little bit of air. The oil tank is under ground and can not see the level. The customer had 100 gals added on Dec 9. Recommend having another delivery due to issue.


Andrew H.

Andrew H. Job Checkin

Performed pm on oil boiler Brushed and vacuumed flue pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Performed combustion and smoke tests 6.8%o2 0ppm co 0 smoke


Larry H.

Larry H. Job Checkin

Performed a heating pm on an oil boiler. Brushed and vacuumed. Replaced the oil filter, nozzle and strainer. Started and checked the safeties. Performed a combustion test. 8.2% o2, 23 ppm, 0 smoke, 82.8% efficient System is operating properly.


Andrew H.

Andrew H. Job Checkin

Performed pm on oil boiler Brushed and vacuumed flue pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Performed combustion and smoke tests


Larry H.

Larry H. Job Checkin

Performed a heating pm on an oil boiler. Brushed and vacuumed. Replaced the oil filter, nozzle and strainer. Started and checked the safeties. Performed a combustion test. 5.0% o2, 39 ppm, 0 smoke, 84.5% efficient System is operating properly.


Andrew H.

Andrew H. Job Checkin

Brushed and vacuumed flue pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Performed combustion and smoke tests While performing the maintenance we found a small amount of water and rust inside the oil filter canister. Recommend getting oil sludge additive to remove any water and sludge buildup. Customer has a space guard 2200 air filter and wants one for ac maintenance


Andrew H.

Andrew H. Job Checkin

Commercial HVAC Service: During a routine maintenance visit to a large office complex, I inspected multiple air handling units, replaced worn belts, cleaned air filters, and calibrated system controls. I also performed airflow testing and refrigerant checks, ensuring all units operated efficiently. This proactive service prevented downtime, maintained occupant comfort, and extended the life of the commercial HVAC systems.


Dyllan  M.

Dyllan M. Job Checkin

Water Heater Repairs: A client experienced lukewarm water from their tank-style water heater. I diagnosed a malfunctioning thermostat and worn heating element. I replaced the defective components, flushed the system to remove sediment, and tested water temperature and pressure. This restored consistent hot water throughout the home while preventing potential future failures.


Andrew H.

Andrew H. Job Checkin

Ductwork Services: I arrived at the client’s home and designed and installed new ductwork to optimize airflow. I measured and sized each section for balanced heating and cooling, sealed all joints with mastic, and insulated ductwork to prevent heat loss. The result was enhanced comfort, improved indoor air quality, and increased HVAC efficiency.


Larry H.

Larry H. Job Checkin

Heating Maintenance: As part of seasonal preventive maintenance, I thoroughly cleaned and inspected the furnace’s burners, blower assembly, and heat exchanger. I checked gas connections, tested safety controls, and calibrated the thermostat. These steps ensured reliable operation, improved fuel efficiency, and minimized the likelihood of emergency repairs during the colder months.


Dyllan  M.

Dyllan M. Job Checkin

Furnace Repair: A client reported that their furnace frequently cycled on and off, causing uneven heating and high energy usage. After inspecting the unit, I identified a faulty limit switch as the culprit. I replaced the switch, tested the system for proper operation, and confirmed that the furnace maintained consistent heat, reducing energy consumption and preventing damage to the unit.


Jonathan L.

Jonathan L. Job Checkin

AC Repair: Responding to a homeowner’s complaint of inadequate cooling, I conducted a detailed system diagnostic, identifying both a refrigerant leak and a failing capacitor. I repaired the leak, replaced the capacitor, cleaned the condenser coils, and tested the system under load. These repairs restored optimal cooling, improved energy efficiency, and prolonged the lifespan of the AC unit.


Dyllan  M.

Dyllan M. Job Checkin

Commercial HVAC Service: At a multi-unit office building, I conducted a full preventive maintenance inspection of all rooftop units and air handling systems. I cleaned condenser and evaporator coils, checked refrigerant levels, inspected electrical components, and tested airflow. By addressing minor issues proactively, I ensured system reliability, energy efficiency, and consistent indoor comfort for employees and clients.