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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 418 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 29, 2026.

X-Treme Temp Heating & Cooling, LLC has completed 357 jobs in Wallingford, CT in the last 12 months. The first job there was in February 2022.

Reviews

Thorough Job
Work was done no problem, thank you!.
Christopher - Wallingford, CT 06492
Excellent service by Larry
Larry took his time cleaning and tuning up our furnace. He pointed out a few things that he will be taking care of shortly.
John - Wallingford, CT 06492
Great service
Gary - Wallingford, CT 06492
Excellent service!
Today we woke up with no heat, Larry came on a Saturday, and fixed the problem. I can’t recommend Xtreme heating and cooling enough, they always come and help when you have a problem.
susan - Wallingford, CT 06492
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

Job Locations

Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance (PM) on the gas boiler, ensuring optimal performance and safety. I meticulously brushed and vacuumed the burner tubes to remove any debris. The burner compartments and surrounding areas were inspected and vacuumed to maintain cleanliness. Electrical connections and safety mechanisms were checked for proper functionality. Gas pressure was verified to ensure it was within safe limits. The flame sensor was cleaned and inspected for any signs of wear or damage. A combustion test was performed, recording an inlet pressure of 6.615 in.w.c., a manifold pressure of 3.196 in.w.c., 8.6% oxygen, and 0 ppm CO. Additionally, I drained 5 gallons of water from the water heater to eliminate sediment buildup, enhancing efficiency and longevity.
Wallingford, CT 06492
Larry H.
Larry H.
the circulator gaskets showed signs of leakage, and the oil tank had two dark spots and a wet weld. I recommended replacing all gaskets and the tank to prevent future leaks.
Wallingford, CT 06492
Andrew H.
Andrew H.
I conducted a comprehensive preventive maintenance check on the gas furnace. This included brushing and vacuuming the burner tubes to ensure optimal airflow. I meticulously inspected and vacuumed the burner, blower compartments, and the surrounding area to remove any dust or debris. All electrical connections and safety mechanisms were checked for proper functionality. Gas pressure was verified to ensure it met safety standards. The flame sensor was cleaned and inspected to guarantee accurate readings. A combustion test was performed, with inlet pressure at 6.934 in.w.c. and manifold pressure at 3.165 in.w.c. Oxygen levels were at 12%, and carbon monoxide levels were at 6 ppm, indicating efficient combustion.
Wallingford, CT 06492
Andrew H.
Andrew H.
I began by draining the system of water and removing the old boiler and associated piping. Next, I installed a new Weil McLain WTGO-4 4 section oil boiler with burner, along with an autofeed, backflow preventer, expansion tank, hi-vent, flue pipe, three circulator pumps, pressure relief, zone panel, flexible oil lines, and all necessary piping. I also installed a mixing valve, temperature/pressure relief, and additional piping. After filling the system with water and purging all air, I started and tested all zones and hot water temperatures, dialing in the mixing valve. Finally, I conducted combustion and smoke tests to ensure everything was functioning correctly.
Wallingford, CT 06492
Andrew H.
Andrew H.
Upon arrival, the unit was operational but had reset. Reviewing the primary control history revealed that the control was shutting off due to high ohms. After pressing the reset button, high ohms persisted, accompanied by sputtering flames. I checked the oil flow, which appeared adequate but slightly inconsistent. Upon inspecting the oil pump, I found that the shaft side of the coupling had become rounded, causing slippage on the oil pump shaft and resulting in intermittent oil flow. I replaced the coupling end and removed the nozzle assembly, discovering that the nozzle was beginning to leak and spray incorrectly. After installing a new nozzle, I started and tested the system, confirming that the unit was functioning correctly. Future maintenance should include a thorough evaluation of the oil pump and coupling to determine if the issue was due to a defective coupling or an oil pump problem. The system's emissions were within acceptable limits, showing 5.2% O2, 2 ppm CO, and no smoke.
Wallingford, CT 06492
Larry H.
Larry H.
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. 5.7% o2, 27 ppm, 0 smoke, 82.6% efficient System is operating properly.
Wallingford, CT 06492
Larry H.
Larry H.
4.9% oxygen, 22 ppm CO, no smoke, and 85.3% efficiency. The system is operating efficiently and safely.
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. I 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 prevent contaminants from entering the system. Additionally, I replaced the air filter with a 16x25x1 size, ensuring clean air circulation. After these replacements, I started the furnace and checked all safety mechanisms to ensure they were functioning correctly. A combustion test was performed, revealing 7.0% oxygen, 23 ppm of CO, no smoke, and an efficiency of 83.3%. The system is now operating properly and efficiently.
Wallingford, CT 06492
Larry H.
Larry H.
I thoroughly inspected the oil tank, ensuring all aspects were examined. There was no oil on the top of the tank, and no oil spots were found on the floor beneath it. I carefully checked the welded seam on the side adjacent to the wall, discovering a residue. After wiping the welded edge, I determined the residue to be old. Additionally, I identified a dark spot on the side just above the weld, which could be a potential concern. Fortunately, this area is not currently leaking.
Wallingford, CT 06492
Larry H.
Larry H.
Upon arrival, I found the burner in a reset state. After resetting the control, the burner motor initiated but failed to ignite. I reviewed the error codes on the primary control, noting that the last two cycles had not resulted in ignition, with ohms readings exceeding 10,000 ohms. Previous cycles had shown ohms readings around 280 ohms. I inspected the fuel at the bleeder on the fuel pump and examined the nozzle assembly, discovering minimal oil. Checking the nozzle line from the fuel pump, I found no fuel flow to the nozzle assembly. The solenoid coil was receiving 120 volts, indicating a faulty coil. I replaced the coil, and the burner started properly, with ohms readings returning to 280.
Wallingford, CT 06492
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
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