What regular HVAC maintenance prevents
Maintenance catches the small, predictable failures before they turn into a breakdown: weak capacitors, dirty coils and flame sensors, clogged drains, and failing safety switches.
Many no-cooling and no-heat calls trace back to a part that was already wearing out before it failed. A capacitor reading below its rating, a condensate line half full of sludge, a flame sensor building up oxide: each of these shows up during a tune-up and costs much less to fix on a scheduled visit than at 9 p.m. in a heat wave.
Maintenance also keeps efficiency up. A dirty outdoor coil or clogged filter makes the system run longer for the same comfort, and you see it on the PG&E bill.
What an HVAC tune-up should include
AC tune-up checklist
- Clean the outdoor condenser coil and clear debris from the cabinet.
- Test the run capacitor against its rating, and inspect the contactor for pitting.
- Measure compressor and fan motor amp draw.
- Check refrigerant performance through temperatures, superheat, and subcooling, without connecting gauges unnecessarily, since each connection can lose a little refrigerant.
- Flush the condensate drain and test the float switch or overflow protection.
- Measure the temperature drop across the indoor coil.
- Tighten electrical connections and check the disconnect.
Furnace tune-up checklist
- Clean the burners and flame sensor, and inspect the ignitor.
- Check the inducer motor, pressure switch, and limit switches.
- Inspect the visible parts of the heat exchanger, the flue, and the vent connections.
- Check gas pressure, measure temperature rise against the furnace rating, and test for carbon monoxide.
- Clear the condensate trap and drain on high-efficiency furnaces.
Heat pump heating check
- Test the reversing valve and force a defrost cycle.
- Check the backup heat strips and sequencers, and confirm the thermostat is set up for a heat pump.
Included in every tune-up
- Change or check the filter, inspect the blower wheel, and check the thermostat's operation.
- Look over the visible duct connections and return.
- A list of anything that's wearing and how urgent it is.
HVAC maintenance calendar for Santa Rosa homes
| When | What to do | Why it matters here |
|---|---|---|
| March to May | Cooling tune-up. Rinse the outdoor coil and clear vegetation 2 feet back. | Spring pollen and grass seed collect on the outdoor coil just before the system starts working hard. |
| June to October | Check the filter monthly, and weekly on smoky days. Rinse the outdoor coil after any ash fall. | Dry-season dust and wildfire smoke load filters and coils much faster than in winter. |
| September to October | Heating tune-up. Run the heat 15 to 20 minutes before you need it. Test CO alarms. | A furnace idle since spring often fails on the first cold night. |
| November to March | Keep the outdoor heat pump clear of leaves. Watch the condensate line on high-efficiency furnaces. Check the system after storm power outages. | Winter storms and outages can trip breakers and leave equipment off or damaged. |
How Santa Rosa's dry season loads your filters and coils
From late spring until the rains return in fall, Santa Rosa gets almost no rain to wash dust and pollen out of the air. Oak pollen comes first, then dry grass seed and fluff from the open hillsides and fields around the city. Fire season adds smoke and ash last.
The outdoor coil of an air conditioner or heat pump pulls thousands of cubic feet of outside air through its fins every minute, and all of that material collects there. Inside, the filter catches everything the system recirculates.
So in Santa Rosa, plan on 2 checks a year. A spring cooling check gets the coil clean before the heat, and a fall heating check gets the furnace ready for its short season. In between, let the outside air set your filter schedule.
A filter that would last 3 months in February can load up in 2 weeks of smoky August air. If you've had heavy smoke, our indoor air quality page explains how to set the system up to handle it.
DIY HVAC maintenance between tune-ups
- Check the filter monthly and replace it when it's gray. Write the date on its frame.
- Keep the outdoor unit clear: no plants, firewood, or stored items within 2 feet. Rinse the coil gently with a hose, never a pressure washer, with the power off.
- Pour a cup of white vinegar into the condensate drain access each spring if your system has one.
- Keep supply registers and the return grille open and unblocked by furniture.
- Test carbon monoxide alarms monthly and replace their batteries yearly.
What affects HVAC maintenance cost
The main factors are how many systems you have (a 2-story home with 2 systems or a multi-zone mini-split takes longer), the type of equipment (a heat pump with backup heat or a condensing furnace has more to check than a basic furnace), how dirty the coils are and whether they need a chemical cleaning, where the equipment sits (attic or crawlspace), and whether any repairs are found during the visit. Repairs are quoted separately, so you can decide on them.
When maintenance turns into a repair call
If you notice ice on the refrigerant lines, water around the furnace, a yellow burner flame, a CO alarm, or a burning smell, don't wait for your next scheduled tune-up. Those are repair problems. See AC repair, furnace repair, or call us right away for anything involving gas or carbon monoxide (after calling 911 or PG&E).
Routine maintenance is the least expensive part of HVAC repair in Santa Rosa, CA: it's how many of those repairs get avoided. Homes with equipment that's now several years old, like many of the fire-rebuilt homes in Coffey Park, are at the age when a yearly check starts paying for itself.
HVAC maintenance questions
How often does an HVAC system need maintenance in Santa Rosa?
Twice a year for a system that heats and cools: a cooling check in spring and a heating check in fall. A furnace with no AC needs one visit a year, in early fall.
Is a tune-up worth it on a new system?
Yes. New systems can have small installation problems, such as a slightly off charge or a drain without enough slope, that show up after the first season. Some manufacturer warranties can also be denied when a failure traces back to neglect, like a coil packed with debris.
How long does a tune-up take?
About an hour to an hour and a half for a single system. Add time for a second system, heavy coil cleaning, or equipment in a tight attic or crawlspace.
What filter should I use?
Use the highest-efficiency filter your system can move air through without restriction. Many systems handle a MERV 8 to 11 in a 1-inch slot. MERV 13, which is better for smoke, usually needs a deeper 4-inch or 5-inch media cabinet to avoid choking airflow.
Schedule an AC or furnace tune-up in Santa Rosa
Call HVAC Pros at (707) 283-3186 to book a cooling check before the heat or a heating check before the cold. If something's already wrong, we'll handle it as a repair visit.