Rocklin, CA: the heat pump payback math
In Rocklin, a heat pump pays for itself within a reasonable window. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $1,000 after a $2,000 federal tax credit. That premium is recovered through $129 of lower running costs every year, landing the payback clock at roughly 7.8 years. The window here is reasonable, and it's specific to what Rocklin actually pays for power and gas.
Rocklin's weather, in the numbers that matter
Degree days tell the story here: Rocklin racks up 2727 heating degree days each year (base 65°F), and summers are hot enough that cooling matters as much as heating, with 1698 cooling degree days on the cooling side. Sizing runs off the design temperature, not the average day: 28.4°F here (record low 26.6°F), which works out to a seasonal COP of 3.05 for the standard class of unit this climate calls for. Rocklin's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. These numbers come from LINCOLN REGIONAL AIRPORT KARL, the closest NOAA station, 8.9 miles out.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 2,264 kWh a year to keep it warm, plus cooling, for a combined electric bill near $1,219 a year. Rocklin's gas rate of 22.01 per Mcf, applied to the 28 Mcf a year the furnace burns, puts its running cost near $1,348 a year, against 32.83¢ per kWh for electricity. Looked at as a full purchase rather than an incremental one, payback here is roughly 85.3 years, leaving the 15-year total $935 ahead.
Electric resistance heat in Rocklin, compared
Gas isn't universal in Rocklin — many houses run on electric heat already. Swap the comparison to resistance heat instead of gas, and Rocklin's answer improves. Switching saves about $1,771 a year here — a heat pump moving heat rather than generating it needs far less electricity than resistance coils — so the extra $5,500 spent up front comes back in about 3.1 years.
How Rocklin compares nationally
Among 3206 cities, Rocklin's winter puts it at rank 2024 for severity, while its size puts it at rank 513 for population — 1 in both cases being the extreme. That's the middle third for winter severity among the cities covered here.
Next step for 75,129 people in Rocklin
Rocklin, California is home to about 75,129 people, and the figures above are the same ones a local HVAC contractor uses to size and quote a system — this site doesn't guess where a real quote would land, it just tells you whether it's worth asking for one. Given the math above, Rocklin is a place worth lining up quotes ahead of a breakdown, not waiting for one.
Ask a local HVAC contractor for a quote before committing either way.
More on how this number was built
Every constant behind this page — the 3.05 seasonal COP, the degree-day corrections, the equipment costs — is documented in the methodology guide. The $2,000 federal credit baked into Rocklin's number is explained, with the before-and-after math, in the tax credit guide.