Heat Pump Payback in Gretna, LA
Gretna, LA: the heat pump payback math
In Gretna, the math is close enough that it comes down to how long you plan to stay. Against a like-for-like gas furnace and AC swap, going electric costs $3,000 more up front here. Lower bills claw that back: about $273 saved annually, for a payback of roughly 11 years. It's a genuine toss-up here, Gretna's numbers don't point clearly either way.
Not the city you meant?
This runs the same numbers for 3206 US cities, not just Gretna. Look one up here.
How cold Gretna actually gets
964 heating degree days pile up here every year, so Gretna barely has a winter to speak of; the cooling side runs to 3433 cooling degree days, where summers are severe enough that cooling can dominate the annual bill. Sizing runs off the design temperature, not the average day: 30°F here (coldest 2024 reading 21°F), which works out to a seasonal COP of 3.09 for the standard class of unit this climate calls for. Gretna's winters don't get cold enough to need the cold-climate premium, a standard unit holds up fine. Source: NOAA station New Orleans NAS, 6.8 miles from Gretna, the closest one on record.
Gretna's running-cost comparison, in dollars
A 2000-square-foot house here would pull roughly 790 heating kilowatt-hours annually on top of cooling, totalling about $503 a year on electricity. The gas furnace it replaces burns roughly 10 Mcf a year at $17.38 per Mcf here, for a running cost near $776 a year including the old AC (electricity here runs 13.52¢/kWh). If the current system still worked and you replaced it anyway, the full cost would take longer than the 15-year equipment life to earn back; against buying a new furnace and AC regardless, the 15-year total lands $1,102 ahead.
What would change Gretna's answer
In Gretna the cooling savings outweigh the extra electricity for heating, so no plausible change in the electricity rate would make the old furnace and AC cheaper to run. A useful quote test for Gretna: the heat pump is worth it within a decade if it costs less than $2,730 more than replacing the furnace and AC, and within 7 years if the gap is under $1,911.
If your home heats with electric baseboard instead of gas
Not every home in Gretna has gas service. Compared with baseboard or electric-furnace resistance heat, the numbers shift in the heat pump’s favor. The gap still doesn't close: the $7,500 incremental cost outlasts the 15-year equipment life here even against resistance heat.
How Gretna compares nationally
Gretna lands at position 2917 out of 3206 cities on heating severity (coldest is 1), and 2177 out of 3206 by population size (biggest is 1). That's the mildest third of cities covered, where utility rates carry more of the answer than climate does.
Deciding what's next in Gretna, LA
Gretna, Louisiana is home to about 17,185 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 Gretna, nothing is lost by holding off until the current equipment genuinely fails.
Line up a few local HVAC quotes before you decide.
More on how this number was built
Nothing above is a black box: the methodology guide shows the full arithmetic behind Gretna's 3.09 seasonal COP and payback figure. Homes in Gretna without gas service should read the electric-resistance comparison instead, the numbers there differ from the gas case above.