Expert HVAC Services in Longmont, CO 80501 - Brennan's Mechanical Contracting

907 Main St, Longmont, CO 80501

(303) 678-1211

Common Questions

Why does my pilot light keep going out on my Longmont furnace?

In Longmont's climate, a frequently failing pilot light is often caused by a dirty thermocouple, a small but critical safety sensor that can get coated in soot. A strong draft down the chimney from our windy days can also blow it out. Our technicians clean and test the thermocouple and inspect the draft hood to ensure it's operating correctly, providing a reliable fix for this common local issue.

My home has hot and cold spots. Can a thermostat fix this?

Uneven temperatures are a frequent complaint in Longmont homes and often stem from an improperly calibrated or outdated thermostat. We check your thermostat's calibration against actual room temperature and its location (away from drafts or heat sources). Often, upgrading to a modern programmable or smart thermostat provides much more precise control, improving comfort and efficiency throughout your entire house.

What HVAC maintenance do you recommend to prevent common Longmont problems?

We recommend bi-annual maintenance, ideally in spring and fall. Our preventative check-up includes cleaning pilot assemblies and burners to prevent failures, calibrating thermostats for accuracy, checking for gas leaks, and ensuring proper airflow. This proactive service catches small issues before they become major repairs, saving you money and keeping your system reliable through our variable Colorado seasons.

Core Services

  • HVAC installation or replacement
  • HVAC system repair

Company Overview

Brennan's Mechanical Contracting is a trusted, local HVAC contractor serving Longmont and the surrounding Front Range communities. Founded on reliability and expert craftsmanship, we specialize in comprehensive heating and air conditioning services, from emergency repairs to full system installations. We understand the specific challenges Longmont homeowners face, such as persistent pilot light failures in older furnaces and thermostat calibration issues that lead to uneven heating and high energy bills. Our certified technicians are skilled in quickly diagnosing these common problems, performing precise repairs, and providing maintenance to ensure your home stays comfortable and your system runs efficiently year-round. We're your neighbors, committed to honest service and lasting solutions for your family's comfort.

Business Location & Hours



Mon:Open 24 hours
Tue:Open 24 hours
Wed:Open 24 hours
Thu:Open 24 hours
Fri:Open 24 hours
Sat:Open 24 hours
Sun:Open 24 hours


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