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

Local Reviews

Rated 5.0 out of 5 stars based on 568 customer reviews

Excellent service

Arrived on time. Appeared to know exactly what to do. Excellent and friendly service.

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Excellent quick service

Thank you for responding so quickly. Much appreciated.

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Great service!

Larry was on time and very professional. They reached out ahead to confirm as well, which was nice. He provided the requested testing/tune up and was able to help with some minor issues that were discovered, right then and there. I would highly recommend.

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Very happy with Andrew

This was my second experience with the company and with Andrew. He was pleasant, straightforward and answered my questions for me to understanding my systems.

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Great service

Andrew got right to work. I observed that he was also sharing his knowledge with his helper.

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Excellent

We’ve trusted Extreme Temp for over five years, and they’ve always been dependable and ready to help whenever needed. The quality of their work is excellent, and it’s a family-run business my parents also use and trust. Best company around—highly recommend!

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Reliable, competent, and customer-oriented

I’ve used Xtreme for all of my HVAC needs (new furnace, ductless and HW heater included. They are skilled, reliable, and straightforward. Their prices are transparent and reasonable

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Larry provided excellent service

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Always a true professional!

It’s comforting to have a reliable, efficient, affordable and timely service provider who is additionally polite and friendly! Andrew and his apprentice were a pleasure to welcome into our home!

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Quality Work

The technician did a great job and left the area clean after finishing the job.

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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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Job Locations

Larry H.

Larry H. Job Checkin

Checked the boiler and the circulator for the basement was not on. Went to jump out the thermostat and noticed that 2 of the 3 mounting screws were tight and making a connection to the sub base. Tightened the 3rd screw and the relay engaged turning on the circulator. The system is operating properly.


Andrew H.

Andrew H. Job Checkin

Furnace Maintenance: Dispatched to perform scheduled maintenance on a commercial furnace. Inspected burners, heat exchanger, blower motors, and electrical controls for proper operation. Cleaned internal components, replaced air filters, and tested safety switches and ignition sequences. Checked ductwork and airflow, verified thermostat and control system communication, and performed multiple heating cycles to ensure consistent temperature, reliable operation, and safe performance.


Andrew H.

Andrew H. Job Checkin

Water Heater Installation: Arrived on-site to replace and install a standard 50-gallon water heater. Connected cold and hot water lines, gas supply, and venting system, ensuring proper pressure and safe installation. Flushed the tank to remove sediment, checked the temperature and pressure relief valve, and tested hot water delivery at multiple fixtures. Verified proper operation and safe, consistent hot water supply.


Jonathan L.

Jonathan L. Job Checkin

Furnace Installation: Dispatched to install a new high-efficiency furnace in a newly constructed home. Installed the unit, connected gas lines, electrical wiring, and ductwork, and calibrated the thermostat and control systems. Tested startup, verified proper ignition, checked airflow and heat output, and ensured all safety controls were functioning. Confirmed safe and reliable operation prior to homeowner orientation.


Dyllan  M.

Dyllan M. Job Checkin

Heating System Repair: Arrived on-site to troubleshoot a furnace that was failing to produce consistent heat. Inspected the burners, heat exchanger, blower assembly, ignition system, and safety controls. Diagnosed a faulty flame sensor and a failing inducer motor causing intermittent operation. Replaced the flame sensor, repaired the inducer motor connection, and tested multiple heating cycles. Verified proper airflow, stable ignition, and consistent heat output throughout the home.


Larry H.

Larry H. Job Checkin

Heating Repair: Dispatched to a home reporting cold spots in several rooms. Inspected the blower motor, ductwork, dampers, and airflow. Found a partially blocked duct and a failing blower motor. Replaced the motor, cleaned and sealed ductwork, and adjusted dampers for optimal airflow. Tested heating performance throughout the home, confirming even temperature distribution and improved comfort.


Andrew H.

Andrew H. Job Checkin

Furnace Replacement: Arrived to replace a failing furnace exhibiting repeated safety shutdowns and inefficient operation. Removed the existing unit, inspected and prepared the ductwork, and installed a new high-efficiency furnace. Connected gas, electrical, and venting systems, calibrated the thermostat and safety controls, and performed multiple startup and heating cycles to verify proper airflow, heat output, and safe operation.


Jonathan L.

Jonathan L. Job Checkin

Water Heater Repair: Dispatched to troubleshoot a gas water heater that was failing to produce hot water. Checked gas supply, pilot assembly, burner operation, and temperature control settings. Found a faulty gas control valve preventing proper ignition. Replaced the valve, flushed the unit to remove sediment buildup, and tested water temperature at multiple fixtures to ensure safe and consistent hot water delivery.


Larry H.

Larry H. Job Checkin

Customer turned the switch on and the burner started. Checked the fuel flow which is ok. While checking the system, the circulator for the main house was making a lot of noise. The water feed was adding water but the pressure was not increasing. Had the customer check the radiators. While adding water the system, found 2 pipes that froze and split. The pipes need to be repaired and the system purged. Repaired five areas that burst. Start a fill system. There is one area above a hard ceiling that is leaking very bad. The ceiling has to be taken down to finish repairing the leaks.


Dyllan  M.

Dyllan M. Job Checkin

Heating Repair: Arrived on-site to diagnose a furnace that was not producing heat. Verified thermostat operation and confirmed a call for heat. Inspected the ignition system, gas valve, flame sensor, and safety controls. Identified a failed hot surface igniter and replaced it. Tested the furnace through multiple heating cycles to confirm proper ignition, flame stability, and reliable heat delivery.


Larry H.

Larry H. Job Checkin

Ductwork Services: Dispatched to address inconsistent temperatures and airflow throughout a residential property. Inspected the duct system for leaks, improperly sized runs, blockages, and poorly insulated sections. Sealed leaks, adjusted dampers, and added insulation where needed. Tested airflow and temperature at multiple vents to confirm balanced heating and cooling distribution across all rooms.


Dyllan  M.

Dyllan M. Job Checkin

Commercial HVAC Service: Arrived on-site to troubleshoot a commercial rooftop HVAC unit with uneven cooling and reduced airflow. Inspected condenser and evaporator coils, fan motors, electrical connections, and control systems. Cleaned condenser fins, replaced a failing fan motor, verified thermostat communication, and tested airflow and temperature output throughout the office. Confirmed the system maintained consistent temperature and proper air distribution under load.


Andrew H.

Andrew H. Job Checkin

Water Heater Installation: Dispatched to install a new tankless water heater. Connected cold and hot water lines, gas supply, and electrical components according to manufacturer specifications. Programmed flow rate and temperature settings, flushed the system to remove debris, tested hot water delivery at multiple fixtures, and verified proper venting and safe operation. Provided homeowner with operational guidance for optimal use and maintenance.


Jonathan L.

Jonathan L. Job Checkin

Furnace Maintenance: Arrived on-site to perform scheduled winter maintenance on a residential furnace. Inspected burners, flame sensor, heat exchanger, inducer motor, blower assembly, and all electrical connections. Cleaned internal components, replaced the air filter, tested safety controls, and confirmed proper ignition and flame stability. Performed multiple heating cycles to verify consistent heat output and safe operation throughout the home.


Larry H.

Larry H. Job Checkin

Checked the burner, the oil was coming from the nozzle line flare on the burner side. Found a crack starting on the flare. Replaced the nozzle line and cleaned inside the burner assembly. Started and checked for any other leaks. System is operating properly.