Comments about cost/benefit of installing heat pump?? I’m in Seattle, climate is mild: Hottest Month [url=https://www.timeanddate.com/weather/usa/seattle/climate#]August[/url] (68 °F avg) Coldest Month [url=https://www.timeanddate.com/weather/usa/seattle/climate#]December[/url] (42 °F avg) ➡️House, built 2007, with ducted natural gas heating 3,700 sq ft; 19 vents looking at installing an electric heat pump I had thought could get a 4 ton 14 SEER unit for maybe $3500 plus installation ....maybe $8k all in? BUT, got a quote for $12K, another for $10k total cost seems really high!! ➡️➡️what kind of energy bill cost savings can I expect IF I do install electric heat pump? seems like a really loooong payback time horizon for this capital outlay. Wondering if it’s smarter to just go with solar on the roof also, these vendors are not giving me a written out J heat/cooling estimate thx for feedback, commendation for either equipment or contractors , or even tips to get an energy rebate out of the utility company !

15+ year old Lennox gas furnace/central AC packaged unit. Furnace finally gave out, presumably the heat exchanger because CO alarm inside the house went off, gas company called, valve shut off at the gas line. Considering replacing the heat exchanger instead of a complete new unit out of economic reasons. 2 winters ago I had to replace the ignition board, and saw that this particular unit has just 2 burners. Does that mean it needs to match to a heat exchanger that specifically has 2 clamshells?