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Heating Cooling Services Wallingford CT

Keep Your Home Comfortable With Quality HVAC Services In Wallingford CT

X-Treme Temp Heating & Cooling is your go-to HVAC service provider in Wallingford, CT! We’re the experts in home comfort year-round, from AC and heating repair to ductwork and water heaters. We’ve got you covered from installation to maintenance so you can have peace of mind about your heating and air conditioning.

Read the reviews below from Wallingford, CT residents to see what your neighbors say about our expertise and customer service. We can’t wait to work with you!

Recent Jobs and Reviews in Wallingford, CT

Rated 5.0 out of 5 stars based on 414 customer reviews

Customers say: The reviews reflect an overwhelmingly positive sentiment, with customers expressing high satisfaction, gratitude, and trust in the company. A dominant theme is professionalism, as customers consistently describe the technicians as polite, knowledgeable, honest, and skilled in their work. Punctuality and responsiveness are also frequently praised, with many noting on-time arrivals, quick turnaround, and the ability to accommodate same-day service requests. Customers appreciate the clear communication they receive, highlighting how questions are answered patiently and thoroughly, and how services are explained in simple terms with no surprises. Fair pricing, quality workmanship, and thoroughness, including leaving homes clean after service, are recurring points of approval. Many reviewers convey a sense of peace of mind and reliability, and a number mention long-term loyalty, repeat business, and strong willingness to recommend the company to others. Overall, the tone is warm, appreciative, and confident, painting a picture of a dependable, customer-focused service provider.

Wallingford, CT at a glance

X-Treme Temp Heating & Cooling, LLC has completed 25 jobs in Wallingford, CT in October 2026.

The 25 customer reviews shown here average 5.0 out of 5.

The most recent job was on October 23, 2026.

X-Treme Temp Heating & Cooling, LLC has completed 355 jobs in Wallingford, CT in the last 12 months. The first job there was in February 2022.

Reviews

Annual furnace cleaning great service
Andrew and his apprentice were very competent
Bill - Wallingford, CT 06492
No issues. Great service.
Dave - Wallingford, CT 06492
Excellent Service experience
Andrew and partner Jerry arrived on time, spent about an hour servicing my 25 year old furnace, did all that they need to do, answered my questions fully and were pleasant, prompt and professional!
Joan - Wallingford, CT 06492
Excellent Service, as always!
Tracey - Wallingford, CT 06492
Excellent Service as usual.
Colleen - Wallingford, CT 06492
Great service.
I called in the morning, and they made room for me in the afternoon on the same day.
Niki - Wallingford, CT 06492
Great service!
Larry and all the Xtreme Temp employees are excellent at what they do. They always leave my home spotless. I highly recommend them for all heating and cooling needs!
susan - Wallingford, CT 06492
Extremely great service
This company always takes care of us and always has fair rates for their work. 10/10 would recommend them to anyone.
Charlee - Wallingford, CT 06492
Excellent Service
We needed to have our Central Air Conditioning air handler unit replaced. Andrew and Larry came out and did a great job. They are knowledgeable and professional and the work is always quality and consistent.
Sue - Wallingford, CT 06492
Larry was great!
Sandra - Wallingford, CT 06492
Great service from start to finish.
Great customer service, great techs… really happy
Niki - Wallingford, CT 06492
Furnace maintenance
Always a pleasure to have Larry do what he does best. He has done tons of upgrades for my properties and no complaints!
Cesar - Wallingford, CT 06492
Consistently outstanding service!
Larry takes all the worries away when it comes to heating and cooling. He explains things in simple terms and keeps you apprised throughout the service. No surprises! Always helpful and thoughtful.
Susan - Wallingford, CT 06492
Great service
Polite, explained service.
Tamara - Wallingford, CT 06492
Great service!
Andrew is so courteous! He knows what he is doing and answers all my questions. I will surely will recommend your company just for the pleasant experience .
Linda - Wallingford, CT 06492
Great service
Gary - Wallingford, CT 06492
Great experience.
Jeff - Wallingford, CT 06492
Excellent service!!!
Very knowledgeable and professional everything was explained in detail and my house was left spotless when they were through I highly recommend them and will definitely be a returning customer!
Sue17j - Wallingford, CT 06492
Excellent service
Explained everything thoroughly/knowledgeable and respectful Answered all our questions
Larock - Wallingford, CT 06492
Great technician!
Larry diagnosed my Fujitsu mini split and had it back up and running in no time! He took the time to answer my questions and explain what was going on.
john - Wallingford, CT 06492
Great service, good guy
John - Wallingford, CT 06492
Excellant
Lori - Wallingford, CT 06492
Fantastic Service
From scheduling my appointment to getting the job done, Larry, Jerry and everyone at Xtreme had me covered. They kept me posted about when they would arrive and they were on time. I wouldn’t recommend any other HVAC company.
Jeff - Wallingford, CT 06492
Very good service
Lisa - Wallingford, CT 06492
Professional employees, and service
Excellent ,professional work,explains issues. I recommend extreme to everybody I talk to., Thank you
Otto - Wallingford, CT 06492

Job Locations

Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance on the oil furnace and oil water heater. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow and safety. I replaced the oil filter, nozzles, and strainers to maintain peak performance. All electrical connections and safety mechanisms were thoroughly checked. Combustion and smoke tests were performed, with the furnace showing 4.6% oxygen, 1 ppm CO, and no smoke, and the water heater at 5.2% oxygen, 0 ppm CO, and no smoke. The customer reported lukewarm water, so I adjusted the mixing valve to increase the temperature to 120°F. Additionally, I recommended a chimney cleaning due to noticeable buildup near the flue pipe entrance.
Wallingford, CT 06492
Andrew H.
Andrew H.
5.1% oxygen, 7 ppm carbon monoxide, and no smoke. Upon starting the system, I observed pressure fluctuations, with the boiler pressure rising from 20 psi to 29 psi. After draining, the pressure stabilized at 19 psi. The expansion tank is faulty, causing pressure issues. I recommended replacing it, but the customer opted not to proceed with the repair today.
Wallingford, CT 06492
Andrew H.
Andrew H.
I meticulously cleaned the flue pipe and heat exchanger, ensuring no debris obstructed airflow. I replaced the oil filter, nozzle, and strainer to maintain optimal performance. All electrical connections and safety features were thoroughly checked for reliability. I conducted combustion and smoke tests, achieving excellent results with 6.5% oxygen, 0 ppm carbon monoxide, and no visible smoke, confirming the system's efficiency and safety.
Wallingford, CT 06492
Andrew H.
Andrew H.
I meticulously brushed and vacuumed the burner tubes to ensure optimal airflow. The burner, blower compartments, and surrounding area were thoroughly inspected and vacuumed to remove any debris. Electrical connections and safety mechanisms were checked for proper functionality. Gas pressure was verified to meet safety standards. The flame sensor was cleaned and inspected for any signs of wear or damage. A combustion test was conducted, recording inlet pressure at 12.8 in.w.c. and manifold pressure at 3.559 in.w.c. Oxygen levels were measured at 10.4% with 6 ppm CO. During the test, a slight increase in oxygen and flame movement were observed when the blower turned on, indicating a potential small crack in the heat exchanger. This suggests the need for future furnace replacement.
Wallingford, CT 06492
Larry H.
Larry H.
I conducted a comprehensive preventive maintenance service on an oil furnace. The process began with a thorough brushing and vacuuming to remove any accumulated dust and debris. I then replaced the oil filter, ensuring it was properly seated to maintain optimal filtration. The oil nozzle and strainer were also replaced to guarantee efficient oil flow and filtration. After these mechanical adjustments, the customer replaced the air filter. I started the furnace and checked all safety mechanisms to ensure they were functioning correctly. A combustion test was performed, revealing 9.9% oxygen, 20 ppm of CO, no smoke, and an efficiency of 82.9%. The system was found to be operating properly, with no issues detected.
Wallingford, CT 06492
Larry H.
Larry H.
I began by safely turning off the power to the unit to ensure a secure working environment. Next, I carefully disconnected and removed the old inducer motor and its gasket. Following this, I installed a new inducer motor and gasket, which were covered under warranty. After confirming the installation, I restored power to the unit. Finally, I started the system and conducted thorough tests to verify proper operation, ensuring everything functioned as expected.
Wallingford, CT 06492
Andrew H.
Andrew H.
Upon arrival, I identified a broken semi-hard water line connecting the solenoid to the humidifier water panel. I disconnected the wires to the solenoid and discovered it was still allowing water to flow despite being powered off, indicating a faulty solenoid. I attempted to close the piercing valve but found it wouldn't seat fully, continuing to let water through. Consequently, I determined that the solenoid needed replacement and a new semi-hard water line installation. I documented the findings and prepared to return with the necessary parts to complete the repair.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance check on the oil boiler. This included brushing and vacuuming the flue pipe and heat exchanger to ensure there were no obstructions or buildup that could impede proper ventilation and efficiency. I replaced the oil filter, nozzle, and strainer to maintain optimal fuel flow and prevent any contaminants from entering the system. All electrical connections and safety mechanisms were meticulously checked to ensure they were secure and functioning correctly. I performed detailed combustion and smoke tests, recording an oxygen level of 6.6%, carbon monoxide levels at 7 ppm, and zero smoke, indicating the boiler was operating efficiently and safely. This thorough maintenance ensures the system will function reliably and efficiently throughout the heating season.
Wallingford, CT 06492
Andrew H.
Andrew H.
5.4% oxygen, 33 ppm carbon monoxide, and zero smoke, confirming the boiler's efficient and safe operation.
Wallingford, CT 06492
Larry H.
Larry H.
I drained the system, replaced the main house zone valve and head, and refilled it. I purged both zones to remove any air. A new Honeywell T4 thermostat was installed for precise temperature control. I started and thoroughly checked both zones, ensuring everything functioned correctly. The system is now operating efficiently and reliably.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance (PM) on the gas boiler, ensuring its optimal performance and safety. I meticulously brushed and vacuumed the burner tubes to remove any debris that could obstruct efficient combustion. The burner compartment and its surrounding area were thoroughly inspected and vacuumed to maintain cleanliness and safety. I checked all electrical connections and safety mechanisms to ensure they were functioning correctly. The gas pressure was verified to meet the required specifications. I tested the low water cut-off and inspected the water piping for any signs of wear or leaks. The flame sensor was cleaned and inspected to ensure accurate readings. A combustion test was performed, with inlet pressure at 7.301 in.w.c. and manifold pressure at 3.635 in.w.c. The test results showed 6.8% oxygen and 6 ppm of carbon monoxide, indicating efficient combustion.
Wallingford, CT 06492
Larry H.
Larry H.
3.5% oxygen, 15 ppm CO, no smoke, and 84.7% efficiency. The system is now operating efficiently.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance on an oil furnace. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow. I replaced the oil filter, nozzle, and strainer to maintain efficient fuel delivery. All electrical connections and safety mechanisms were checked for reliability. Combustion and smoke tests were performed, resulting in readings of 7.8% oxygen, 7 ppm carbon monoxide, and zero smoke, indicating proper operation.
Wallingford, CT 06492
Larry H.
Larry H.
I conducted a comprehensive preventive maintenance service on an oil boiler. I meticulously brushed and vacuumed the unit to remove any debris. I replaced the oil filter, nozzle, and strainer to ensure optimal performance. After starting the boiler, I checked all safety mechanisms. I performed a combustion test, achieving an oxygen level of 8.7%, 48 ppm, and 82.9% efficiency. The system is now operating efficiently and safely.
Wallingford, CT 06492
Andrew H.
Andrew H.
4.9% oxygen, 3 ppm carbon monoxide, and zero smoke. During the start-up and testing phase, I identified a leaking flared oil line connecting the oil pump to the nozzle assembly. I promptly replaced the faulty line and retested the system, which is now functioning correctly.
Wallingford, CT 06492
Larry H.
Larry H.
4.4% oxygen, 36 ppm, no smoke, and 81.8% efficiency, indicating proper operation. However, significant corrosion was found on the hot water line from the boiler to the mixing valve. I recommend replacing the affected piping and mixing valve or installing an electric hot water heater adjacent to the boiler.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance on the gas boiler and gas water heater. I meticulously brushed and vacuumed the burner tubes, ensuring no debris obstructed airflow. The burner compartments were inspected and vacuumed to maintain optimal efficiency. All electrical connections and safety mechanisms were checked for proper functionality. Gas pressure was verified, and a combustion test was performed, recording an inlet pressure of 9.421 in.w.c. and a manifold pressure of 3.312 in.w.c. The burner assembly was removed, thoroughly cleaned, and the flame sensor was inspected and cleaned. The water heater was drained, and a final combustion test was conducted post-cleaning.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance check on the oil furnace. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow. I replaced the oil filter, nozzle, and strainer to maintain efficient fuel delivery and filtration. All electrical connections and safety mechanisms were thoroughly inspected and tested. I performed combustion and smoke tests, achieving excellent results with 5.0% oxygen, 0 ppm carbon monoxide, and no visible smoke, confirming the furnace's safe and efficient operation.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a thorough preventive maintenance check on the oil boiler. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow. I replaced the oil filter, nozzle, and strainer to maintain efficient fuel delivery. All electrical connections and safety mechanisms were inspected and confirmed to be functioning correctly. I performed combustion and smoke tests, achieving optimal readings of 6.0% oxygen, 1 ppm carbon monoxide, and zero smoke, ensuring the system operates safely and efficiently.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance service on the oil boiler. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow and efficiency. I replaced the oil filter, nozzle, and strainer to maintain proper fuel delivery and filtration. All electrical connections and safety mechanisms were thoroughly checked for integrity and functionality. I performed combustion and smoke tests, achieving excellent results with 4.0% oxygen, 20 ppm carbon monoxide, and zero smoke, indicating efficient and safe operation.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance service on the oil boiler. This included brushing and vacuuming the flue pipe and heat exchanger to ensure optimal airflow and efficiency. I replaced the oil filter, nozzle, and strainer to maintain clean fuel delivery and prevent clogging. All electrical connections and safety mechanisms were thoroughly checked for proper function and safety compliance. I performed combustion and smoke tests, achieving optimal results with 5.4% oxygen, 2 ppm carbon monoxide, and zero smoke, indicating efficient and safe combustion. This maintenance ensures the boiler operates efficiently and safely.
Wallingford, CT 06492
Andrew H.
Andrew H.
Upon arrival, the unit was powered on with a call for heat, but it was not operational. The furnace displayed an e32 error code, indicating a pressure switch issue. I cycled the power to observe the start-up sequence. The inducer motor, which should have started, did not operate despite having power. Upon inspection, the motor was excessively hot, and the shaft was seized. I manually broke the shaft loose and applied lubricant to free it. After cycling the power on and off six times, the inducer motor started successfully. I took detailed pictures to facilitate ordering a replacement inducer motor.
Wallingford, CT 06492
Andrew H.
Andrew H.
Upon arrival, I assessed the operational status of the unit, which was running. The temperature reading was 170°F, but the return water temperature was only 70°F, indicating a restriction in the supply pipes. I began by bleeding air from all heating pipes, ensuring that cold water was returning. After thorough inspection and bleeding, I restarted the system. The return water temperature increased, confirming that the restriction had been resolved and there were no longer any air pockets blocking the water flow. The unit is now functioning correctly. The boiler pressure was 19 psi when I left, indicating optimal performance.
Wallingford, CT 06492
Andrew H.
Andrew H.
I meticulously cleaned the flue pipe and heat exchanger, ensuring all debris was removed to maintain optimal airflow. The oil filter, nozzle, and strainer were replaced to guarantee efficient fuel delivery and filtration. I thoroughly inspected all electrical connections and safety mechanisms to confirm they were secure and functioning correctly. Conducting combustion and smoke tests, I achieved a reading of 9.0% O2 and 29 PPM, with zero smoke detected, indicating the system was operating safely and efficiently. This comprehensive service ensures the heating system will perform reliably and safely throughout the season.
Wallingford, CT 06492
Larry H.
Larry H.
I conducted a comprehensive preventive maintenance service on an oil furnace. The process began with thorough brushing and vacuuming to remove any accumulated dust and debris, ensuring optimal airflow. I then replaced the oil filter, nozzle, and strainer to maintain efficient fuel delivery and filtration. After these replacements, I started the furnace and meticulously checked all safety mechanisms to confirm they were functioning correctly. A combustion test was performed, revealing an oxygen level of 6.8%, carbon monoxide at 20 ppm, and an efficiency rating of 84.7%. These readings indicated that the system was operating within acceptable parameters. Overall, the furnace is in excellent working condition.
Wallingford, CT 06492
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