Sub Zero Heating & Air Conditioning - Boulder's Emergency HVAC Repair

We specialize in heating and cooling systems, minor plumbing, and indoor air quality services. Our Master Mechanical Certified technicians provide everything from repairs and maintenance to installations, with a focus on working with your existing equipment to keep costs down for Boulder residents.

For thermostat calibration issues, our technicians diagnose and adjust settings to ensure accurate temperature control, which is especially important in Boulder's varying climate. For refrigerant leaks, we perform thorough inspections to locate and repair leaks safely, following EPA guidelines to protect your system and the environment. We aim to fix these problems efficiently to restore comfort without unnecessary replacements.

With over 25 years of experience, we believe in honest, affordable service. We first assess if repairs or maintenance can extend your system's life, saving you money. Our goal is to provide reliable solutions tailored to your needs in Boulder, ensuring you get the most value from your current equipment before considering a replacement.