Splenda t1_ivar9vh wrote
Reply to comment by Prototype_es in New dwellings in Washington state must be warmed by heat pumps, rather than furnaces, beginning in July, state board rules Friday by BarnabyWoods
That depends entirely on where you live and which heat pump you choose. The latest high-HSPF models rarely resort to backup even in USDA zone 4. Still, I think we'll see many owners of existing homes there replacing older central AC units with heat pumps while keeping gas for security, much as many Canadians do. This will change over time as cold weather heat pumps keep improving.
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