HVAC maintenance in Fremont works best as two short visits a year: a cooling tune-up in spring, before the hot afternoons from June to September, and a heating tune-up in fall, before furnaces and heat pumps start running in November. Each visit tests the system the way it will actually be used, cleans the parts that collect dust and dirt, and catches the weak capacitor, dirty flame sensor or clogged drain that would otherwise stop the system on the first hot or cold day. We maintain furnaces, air conditioners, heat pumps and ductless systems in homes across Fremont, Newark and Milpitas.
Fall: furnace tune-up
- Run a full heating cycle and watch the ignition sequence from start to finish
- Clean the flame sensor and inspect the igniter
- Check the burners and the flame
- Check the inducer, pressure switch and venting; on high-efficiency furnaces, clean the condensate trap and drain
- Inspect the heat exchanger as far as it can be seen
- Test the high-limit and rollout safety switches
- Check the blower, its motor and the electrical connections
- Measure the temperature rise and compare it with the furnace’s label
- Check or replace the filter, and test the thermostat
Spring: air conditioner tune-up
- Clean the outdoor coil and straighten bent fins
- Test the capacitors, the contactor and the disconnect
- Check the outdoor fan motor and the compressor’s current draw
- Check refrigerant performance from temperatures and pressures. If it is low, we look for the leak instead of only topping it off.
- Inspect the indoor coil and blower, and measure the temperature drop across the coil
- Flush the condensate drain and test the float switch
- Check the filter and the thermostat
Heat pumps and ductless systems
A heat pump gets both checklists plus the parts only a heat pump has: the reversing valve tested in heating and in cooling, a defrost test, the backup heat strips, and the thermostat’s heat pump settings, including when backup heat is allowed to run. Ductless indoor units need their filters and coils cleaned and their drains checked; dirty ones lose airflow and can start to smell. More on what goes wrong with them on our heat pump repair page.
What maintenance does, and what it cannot do
A tune-up prevents many breakdowns by finding worn parts while they still work, keeps the system closer to its rated efficiency, and helps it last longer. Some manufacturer warranties also expect regular professional maintenance. It cannot fix ducts that are too small, a system that was sized wrong, or a compressor at the end of its life, and we will tell you plainly if that is what we find. Nothing is replaced without your approval. If a part is failing, you get the reading and the price first, and repairs carry a 90-day workmanship warranty.
How a maintenance visit works
- Schedule. Book your spring or fall visit by phone or online.
- Inspect. A full system check: electrical, airflow, controls and safety devices.
- Service. Cleaning and adjustments: coils, sensors, drains, connections.
- Test. Performance readings with the system running, compared with the manufacturer’s specifications.
- Report. A written maintenance summary of what we checked, what we found and anything that needs watching.
Between visits: what you can do yourself
- Filters. Check them monthly during heavy use. Thin 1-inch filters usually need changing every one to three months; thicker media filters last longer. Many smart thermostats can remind you based on actual run time.
- The outdoor unit. Keep plants, leaves and stored items a couple of feet away. Fremont’s dry summers leave dust and leaves packed against coils.
- The condensate drain. Water near the indoor unit, or in the pan under an attic unit, means the drain is backing up.
- Runtime reports. If your smart thermostat shows the system running much longer than usual to hold the same temperature, that is often an early sign of a dirty coil, a clogged filter or a refrigerant leak. Book a visit before it turns into a breakdown.
Leave gas, electrical and refrigerant work to a technician.
Local notes
Dry, dusty summers load filters and outdoor coils quickly here, and many older homes in Fremont and Newark have ducts in the attic or crawlspace, where leaks and loose joints pull in dust. If dust keeps coming back, look at duct cleaning or indoor air quality options. In Milpitas townhomes, filters in compact closets are easy to forget, and rooftop condensers need safe access, so mention it when you book. City pages: furnace maintenance in Fremont, AC maintenance in Fremont, Newark and Milpitas.