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Sizing a heat pump for a Tehama County home is not a desk calculation a contractor can finish without local inputs. Homes in Tehama County, CA run heat about eight months a year, from October through May. As outdoor temperatures drop through those months, a heat pump's capacity falls off, and a system specced too lean does not coast through the gap quietly. The compressor works harder to extract heat from cold outside air, and the backup resistance element runs more often than it should, drawing more power and wearing faster. A contractor quoting a install here has to establish the coldest sustained temperatures this house actually sees before they can commit to a capacity figure.
Ductwork and electrical panels in older houses were built around whatever system was running at the time, and a heat pump puts different demands on both. Half the homes in Tehama County, California were built in 1981 or earlier (2020-2024 ACS 5-year). Panels that were adequate then are often undersized for the load a heat pump draws, so an electrician's assessment of the existing service is part of the installation job, not a separate errand. What the ductwork can carry matters too. A contractor has to open both questions before a unit can be chosen.
What Gets Installed With a New Heat Pump

The outdoor unit is the piece most homeowners notice first. It sits on a pad beside the house and holds the compressor and the outdoor coil, which together do the heavy lifting of moving heat between inside and outside. An air handler or furnace cabinet installed in a closet, attic, or utility room holds the indoor coil and the blower that pushes conditioned air through the house.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. A thermostat goes on an interior wall and gives the homeowner control over the whole system. Some installs also include a disconnect box near the outdoor unit, which allows the equipment to be shut off safely at the source.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home and its existing setup.
Get matched in Tehama CountyTehama County, by the numbers
172 severe weather events were recorded in Tehama County, California between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Tehama County, California were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesTehama County, California holds 27,527 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.1% of the occupied homes in Tehama County, California (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules and Standards Behind Heat Pump Installation in Tehama County, California1 sourced rules and standards
Licensing Rules for Tehama County, California
California requires a state contractor license: it is a misdemeanour to engage in the business of, or act in the capacity of, a contractor in California without one, unless the work is exempt.
Severe Weather Events in Tehama County
Weather puts a load on heating and cooling equipment, and that load varies by where you live. A heat pump sized and installed for local conditions handles the work that local weather actually asks of it.
172 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
