For most Denver homes, MERV 11-13 is the sweet spot. MERV 11 catches dust, pollen, mold spores, and pet dander. MERV 13 adds smoke particles and bacteria — useful during wildfire season. Higher than MERV 13 can restrict airflow and damage your system unless it's specifically designed for high-MERV filters.
Every 1-3 months depending on conditions. With pets, change monthly. During wildfire season, check weekly. In winter with no pets, every 2-3 months is usually fine. A dirty filter is the number one cause of HVAC breakdowns — and the easiest to prevent.
A $15 MERV 11 filter outperforms a $3 fiberglass filter by a wide margin. But a $30 MERV 16 filter in a system designed for MERV 8 will restrict airflow and could damage your blower motor. Match the filter to your system's specifications — more expensive isn't always better.
If you're dealing with this issue in the Denver Metro area, the most important thing is getting a proper diagnosis from a NATE-certified technician who understands Colorado's altitude. At 5,000+ feet, HVAC systems behave differently than at sea level — refrigerant pressures, combustion efficiency, and airflow all change with elevation. A technician who doesn't account for altitude can misdiagnose the problem entirely. On Time Heat & Air has been serving the Front Range since 2013 with same-day service, upfront pricing, and no overtime fees for emergency calls. Call (720) 527-0668 for a diagnosis.
Colorado's climate creates unique HVAC challenges that homeowners in other states don't face. Our dry air, intense UV exposure, extreme temperature swings (it's not unusual to see 60°F days followed by 20°F nights), and hail storms all take a toll on heating and cooling equipment. Systems here work harder and fail in different ways than identical systems at sea level.
Brighton, where we're based, sits at 4,984 feet. Denver is at 5,280 feet. Aurora, Lakewood, Arvada, Westminster — they're all above 5,000 feet. That altitude affects everything from gas pressure in your furnace to refrigerant charge in your AC to the amount of air your blower motor needs to move. Every system we install or repair is calibrated specifically for Front Range conditions.
We're licensed in 8 Colorado counties with active, verifiable license numbers displayed on our website. Our technicians are NATE certified — the highest certification in the HVAC industry. And we've maintained a 5.0 Google rating across 70+ reviews because we show up on time, diagnose honestly, price upfront, and fix it right the first time.
NATE Certified · Licensed in 8 Counties · Same-Day Service