Viewing a single comment thread. View all comments

zeeke42 t1_j7pk7od wrote

Reply to comment by magellanNH in Heat Pumps During Recent Cold Weather by thread100

Heat pumps beat oil pretty well in the shoulder seasons. When it's like 45-50F outside, and they run at low load, they're crazy efficient.

1

magellanNH t1_j7ppqco wrote

Most heat pumps on the market today will beat oil at temps much much lower than 40 degrees. That 40 degree cutover number is from heat pump technology over 5 years old. The industry has really improved low temp efficiency a ton in the last 5 years.

My Bosch unit (installed in 2022) runs with a COP of 2.4 at 5 degrees. With that COP it's still cheaper than oil to run. As temps go above 5 degrees into the 10s and 20s and 30s, it becomes significantly cheaper than oil (as much as 1/2 the cost at higher temps).

Most current Mitsubishi mini-split models, even the non-hyper heat ones, maintain a COP around 2.2 down to 0 degrees or so. At temps above 10-15 F, they're often closer to a 3.0 COP and some make it close to a 4.0 COP in the upper 20s and 30s.

1

zeeke42 t1_j7pt6ca wrote

Yeah, they beat oil at the lower temps, but they absolutely wipe the floor with it at the higher ones. COP at 47F on some of the newer LG systems is pushing 6! It's better at 10-15 than I realized though, thanks!

2