Heat Pump Payback in Rockville, MD
Rockville, MD: the heat pump payback math
The payback math works in Rockville on paper, past the equipment's own working life. Swap a failed furnace and AC for a heat pump rather than buying like-for-like, and the extra cost here runs $5,500. That premium is recovered through $119 of lower running costs every year, landing the payback clock at roughly 46.4 years. That's a technicality, not a recommendation, for anyone actually living in Rockville.
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Rockville is one of 3206 cities covered here, each run through the same model. Search another below.
Rockville's weather, in the numbers that matter
3720 heating degree days pile up here every year, so Rockville has a real but manageable winter; the cooling side runs to 1541 cooling degree days, where summers are hot enough that cooling matters as much as heating. Sizing runs off the design temperature, not the average day: 14.9°F here (coldest 2024 reading 12.9°F), which works out to a seasonal COP of 3.06 for the cold-climate class of unit this climate calls for. A cold-climate unit is the right call in Rockville, below 25°F design temperature, a standard heat pump leans hard on electric-resistance backup, which erases most of the savings. Source: NOAA station College Park AP, 14.4 miles from Rockville, the closest one on record.
Rockville's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 3,078 heating kilowatt-hours annually on top of cooling, totalling about $929 a year on electricity. The gas furnace it replaces burns roughly 39 Mcf a year at $16.14 per Mcf here, for a running cost near $1,048 a year including the old AC (electricity here runs 21.16¢/kWh). Buying outright rather than at replacement time stretches payback to longer than the 15-year equipment life. Over 15 years, compared with a like-for-like replacement, the heat pump leaves you $3,722 behind.
What would change Rockville's answer
Gas would only overtake the heat pump in Rockville if electricity rose past 26.1¢/kWh from 21.16¢, or gas fell under $13.08 per Mcf from $16.14. A useful quote test for Rockville: the heat pump is worth it within a decade if it costs less than $1,190 more than replacing the furnace and AC, and within 7 years if the gap is under $833.
The other scenario: no gas furnace to begin with
Plenty of homes in Rockville heat with electricity alone, no gas line involved. Swap the comparison to resistance heat instead of gas, and Rockville's answer improves. The saving here runs about $1,486 a year, which recovers the extra $10,000 spent going electric in roughly 6.7 years.
Rockville against the rest of the country
Ranked against the other 3206 cities covered, Rockville comes in at 1660 for heating severity, 1 would be the coldest place in the dataset, and 570 by population, where 1 is largest. That's the middle third for winter severity among the cities covered here.
Next step if you live in Rockville
Rockville, Maryland is home to about 68,417 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. In Rockville, nothing is lost by holding off until the current equipment genuinely fails.
Get quotes from local HVAC contractors before deciding.
Where Rockville's figure comes from
The methodology guide walks through exactly how Rockville's 3.06 seasonal COP and the rest of this page's numbers get built. At a 14.9°F design temperature, Rockville sits in cold-climate territory; the guide to that class of unit explains why.