Tune-up is one of those terms that means different things depending on who you hire. Some companies run a 10-point checklist in 20 minutes that is mostly a sales call for filters and accessories. A real HVAC tune-up at elevation is more involved and more important than that.
Here is what a comprehensive tune-up includes, and why living at 7,000 to 8,500 feet changes the calculus on several of these items.
What a Real HVAC Tune-Up Covers
Combustion Analysis
For gas and propane furnaces, combustion analysis measures the actual efficiency of the burn: carbon monoxide levels, flue gas temperature, and oxygen content. At elevation, the air-to-fuel ratio shifts. An improperly adjusted burner at 7,500 feet produces incomplete combustion, meaning lower efficiency, higher fuel consumption, and elevated CO risk. If your contractor does not do combustion analysis, that is a gap.
Heat Exchanger Inspection
A cracked heat exchanger is a serious safety issue. It allows combustion gases including carbon monoxide to mix with circulated air. In our climate, heat exchangers are under more thermal stress than at lower elevations. Visual inspection with a mirror or camera is standard, and some contractors add a combustion spillage test.
Airflow Measurement
Proper airflow through the air handler is critical to equipment efficiency and longevity. Undersized return air, clogged coils, or a dirty blower wheel all restrict airflow and cause the system to work harder. At elevation, where air is already less dense, restricted airflow has a compounding effect. A real tune-up measures static pressure, not just visually inspects the filter.
Refrigerant Charge Verification
For cooling systems, refrigerant charge is checked against manufacturer specifications at actual operating conditions. Altitude affects refrigerant system pressures. A system properly charged at sea-level specifications runs slightly off-spec at 7,000 feet. This is a nuance most HVAC technicians from lower elevations have not encountered.
Electrical Safety Check
Capacitors, contactors, and disconnect connections are inspected for wear or failure. A failing capacitor caught at a tune-up costs around $100 to replace. The same capacitor failing mid-July when HVAC service demand is high costs time and comfort on top of the part.
Thermostat Calibration
If your thermostat reads a degree or two off, your system is cycling when it should not or not cycling when it should. Smart thermostats can be checked for proper calibration and scheduling. Older thermostats may need leveling or replacement.
Filter Check and Documentation
At elevation with lower air density, some filter ratings are effectively more restrictive than at sea level. MERV 13 filters popular for air quality can reduce airflow in systems not designed for them. We document what is in place and make sure it is appropriate for the equipment.
How Often to Schedule a Tune-Up
Annually is the standard recommendation: once in fall before heating season, or once in spring before cooling season. In the valley, where heating systems run hard from October through May, fall tune-ups tend to be most impactful. If your system is more than 10 years old, a tune-up also gives us a real read on remaining service life so you can plan a replacement on your timeline, not in a January emergency.
PSM's HVAC Coverage
We service Aspen, Snowmass Village, Basalt, Carbondale, Glenwood Springs, Rifle, and surrounding Garfield and Pitkin county communities. Rush service during business hours for system failures. Routine maintenance scheduled in advance. One call for HVAC, plumbing, and roofing.
