Will a heat pump pay off in Rosemead, CA?
Rosemead clears a genuine payback here, inside a reasonable stretch of years. Against a like-for-like gas furnace and AC swap, going electric costs $1,000 more up front here (already netting out a $2,000 tax credit). Rosemead's residents would see roughly $323 a year back in running costs, putting the payback around 3.1 years. The window here is reasonable, and it's specific to what Rosemead actually pays for power and gas.
How cold Rosemead actually gets
686 heating degree days pile up here every year, so Rosemead barely has a winter to speak of; the cooling side runs to 2300 cooling degree days, where summers are hot enough that cooling matters as much as heating. 39.2°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 37.4°F on file. Worked through the model, that's a seasonal COP of 3.37 on the standard unit fit for this climate. Rosemead's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. Source: NOAA station EL MONTE AIRPORT, 3 miles from Rosemead — the closest one on record.
What it actually costs to run, year to year
Modelled on a typical 2000-square-foot house, the heat pump draws about 515 kWh a year to keep it warm, plus cooling, for a combined electric bill near $813 a year. Rosemead's gas rate of 22.01 per Mcf, applied to the 7 Mcf a year the furnace burns, puts its running cost near $1,136 a year, against 32.83¢ per kWh for electricity. Buy it outright, not incrementally, and payback stretches to 34.1 years; over 15 years the net position sits $3,842 ahead.
The other scenario: no gas furnace to begin with
Gas isn't universal in Rosemead — many houses run on electric heat already. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. The saving here runs about $736 a year, which recovers the extra $5,500 spent going electric in roughly 7.5 years.
How Rosemead compares nationally
Ranked against the other 3206 cities covered, Rosemead comes in at 3004 for heating severity — 1 would be the coldest place in the dataset — and 827 by population, where 1 is largest. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Next step for 49,582 people in Rosemead
Rosemead, California is home to about 49,582 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, Rosemead is a place worth lining up quotes ahead of a breakdown, not waiting for one.
Get quotes from local HVAC contractors before deciding.
More on how this number was built
The methodology guide walks through exactly how Rosemead's 3.37 seasonal COP and the rest of this page's numbers get built. The $2,000 federal credit baked into Rosemead's number is explained, with the before-and-after math, in the tax credit guide.