Heat Pump Repair in Modesto, CA
Homes here need heat from November through April and cooling from May through September. If your system quits, tell us what it's doing and a licensed contractor who covers Stanislaus County will get in touch.
Tell us about the job
It takes about a minute.
Your heat pump works almost all year here
Modesto asks a heat pump to heat from November through April, then cool from May through September. That is 11 months out of the year with barely a break between seasons. It cycles on nights that average 39°F and on afternoons that reach 91°F, and each start puts a little more wear on the parts that reverse it between heating and cooling.
The outdoor unit sits through whatever the weather does, and Stanislaus County has seen 18 damaging wind events over the past ten years. A power interruption during one of these can trip the system, and it may need to be reset before it runs again.
- 6 months
- November through April, your system heats
- 5 months
- May through September, it cools
- 39°F
- the average winter night it heats against
- 91°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
California requires HVAC contractors to hold a state license.
The Contractors State License Board tests contractors before issuing a license and keeps a record of who holds one. That license belongs to the contractor, not to any single job, so it stays with them from one repair to the next rather than being issued fresh each time.
For a heat pump repair, the license is what stands behind the work in California. If the repair involves opening the refrigerant side of the system, which is often where a heat pump problem sits, the technician doing that part also has to hold EPA Section 608 certification. That certification is federal and separate from the state license, but both apply here.
Sources: California Legislative Counsel · Contractors State License Board
- Why is my heat pump blowing cold air?
- In heating mode, a heat pump puts out air that feels cool next to your skin even when it's working right, because the air coming out is warmer than the room but still cooler than your body. If the air is actually cold, not just cool, check that the thermostat is set to heat and not fan only. A frozen outdoor coil or a system stuck in defrost can also leave you with cold air for a while. If it stays cold and never warms up, the system needs a contractor to look at it.
- Why is there ice on my heat pump?
- Some frost on the outdoor unit during a cold snap is normal, and the system should clear it on its own through a defrost cycle. Ice that builds up thick or stays for days points to a real problem, usually low refrigerant, a dirty coil, or a fan motor that isn't moving enough air across it. Winter nights here average 39°F, cold enough for this to happen more than once through the season. If the ice keeps coming back after the unit defrosts, have a licensed contractor check it.
- Why is my heat pump running but not cooling?
- If the unit is running but the air coming out isn't cold, start with the filter and the outdoor coil, since a filter clogged with dust or a coil packed with debris blocks the airflow the system needs to cool. Check that the outdoor unit isn't crowded by plants or fencing that cuts off airflow around it. With summer afternoons here reaching 91°F, a system fighting restricted airflow can run a long time without catching up. If those look clear and it's still not cooling, the refrigerant charge or the compressor likely needs a contractor's diagnosis.