HVAC - 4Therm Mechanical, Inc.

Heating & Cooling Services

At 4Therm, we believe comfort shouldn’t come with unnecessary replacements. Our heating and cooling services are built around honest diagnostics, practical repairs, and solutions that make sense for your home and budget.

Air Conditioning Services

Beat the heat with dependable cooling solutions:

AC repair
AC installation & replacement
Performance issues & airflow problems
Preventative maintenance

We work to extend the life of your system and improve efficiency without overcomplicating the solution.

Heating Services

Stay warm and safe through Colorado winters with professional heating service.

Furnace repair
Furnace replacement
Heating system diagnostics
Seasonal tune-ups and maintenance

If your system can be repaired, we’ll tell you. If replacement is the better long-term option, we’ll explain why — clearly and honestly.

Why Choose 4Therm for HVAC?

Focused on Repairs, Not Sales
If your furnace or AC can be repaired safely and effectively, we’ll fix it — no pressure to replace equipment before it’s truly needed.
Over 10 Years of Hands-On HVAC Experience
From furnaces and air conditioners to airflow issues and system performance, we’ve seen it all in Colorado homes.
Licensed, Insured, and Done Right
Your HVAC system is a major investment. We handle every job professionally and in compliance with local codes.
Local Service with Personal Attention
We serve Longmont, Firestone, Frederick, and surrounding areas — and treat every home like it’s our own.
Flexible Scheduling for Real Life
Heating and cooling problems don’t always happen 9–5. We offer off-hour appointments when needed.

Whether your system needs a simple repair or a professional assessment, we’re here to help you make the right decision for your home — not the most expensive one.