@derek My winter electric bill has doubled, which is not bad considering (and it's all renewables thanks to my power company) and I only use the boiler when I'm expecting company. My office is now mostly pleasant instead of barely tolerable. Bedroom too. Some new things to learn about how heat pumps work compared to ancient/giant radiators and they will never replace the boiler system here completely but they take a big dent out of my boiler use and that's been great to see.