Heat pump vs. gas furnace in Azusa, CA
Azusa clears a genuine payback here, inside a reasonable stretch of years. 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. Azusa's residents would see roughly $251 a year back in running costs, putting the payback around 4 years. The window here is reasonable, and it's specific to what Azusa actually pays for power and gas.
How cold Azusa actually gets
1219 heating degree days pile up here every year, so Azusa barely has a winter to speak of; the cooling side runs to 1906 cooling degree days, where summers are hot enough that cooling matters as much as heating. 37.4°F is the figure equipment gets sized against here — the 99th-percentile cold snap, not an average day — with a record low of 35.6°F on file. Worked through the model, that's a seasonal COP of 3.31 on the standard unit fit for this climate. Azusa's winters don't get cold enough to need the cold-climate premium — a standard unit holds up fine. Source: NOAA station BRACKETT FIELD AIRPORT, 7.9 miles from Azusa — the closest one on record.
The month-to-month numbers for Azusa
Electricity use for heating alone comes out to about 933 kWh a year on the 2000-square-foot reference house; folding in cooling puts the electric bill near $840 a year. The gas furnace it replaces burns roughly 13 Mcf a year at 22.01 per Mcf here, for a running cost near $1,090 a year (electricity here runs 32.83¢/kWh). Priced as a standalone purchase rather than against a like-for-like replacement, equipment payback runs about 43.9 years, for a 15-year net position $2,761 ahead.
The other scenario: no gas furnace to begin with
Not every home in Azusa has gas service. Against electric-resistance heat — baseboard or an electric furnace, both 100% efficient but still just resistance — the case for switching gets stronger here. Switching saves about $985 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 5.6 years.
Azusa against the rest of the country
Among 3206 cities, Azusa's winter puts it at rank 2791 for severity, while its size puts it at rank 852 for population — 1 in both cases being the extreme. That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Next step for 48,383 people in Azusa
Azusa, California is home to about 48,383 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, Azusa 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.
Reading further on this page's numbers
The methodology guide walks through exactly how Azusa's 3.31 seasonal COP and the rest of this page's numbers get built. The $2,000 federal credit baked into Azusa's number is explained, with the before-and-after math, in the tax credit guide.