![]() At the carbon-optimized switchover point, the furnace and the heat pump have identical GHG emissions. You talk about how we want to optimize for GHG based on all of these things, but there might be a relatively simple approach available instead because of a few important things:ġ. When will we get the heat pump thermostats we need? - Energy Technology RevolutionĪnd yet one more comment (that's how good and thought-provoking the blog post was, enough to generate 3 thoughts worth sharing): , Justin Spencer, Nikki Arnone, Nate Adams #dualfuel #heatpumps #climatechange #thermostats People who I think will be interested: Kevin DeMaster, Christopher Dymond, dai. Organizations mentioned: Google Nest Pro, ecobee,, Enel X, Oak Ridge National Laboratory, The Air-Conditioning, Heating, and Refrigeration Institute (AHRI), Mitsubishi Electric People who are quoted within: Geoff Hancock, Daniel MyersĪuthors of references linked to: Matt Malinowski, Max Dupuy, David Farnsworth, Zhenning Li, Kyle Gluesenkamp, Bo Shen, Helia Zandi, Praveen Cheekatamarla To learn what those elements are, what groups are working to develop these thermostats, and when they might be ready to put a product on the market, please read my post clicking here: We already have most of the technology needed to make thermostats capable of minimizing emissions or costs, but a few key elements are lacking. As a result, dual-fuel system owners, and indeed all of us, are only getting a portion of the benefits available. Current dual-fuel thermostats switch between the heat pump and the furnace based on temperature and aren’t capable of making such complex decisions. In practice, though, thermostats that would enable these operating modes don’t exist yet. A dual-fuel system thermostat could either minimize carbon dioxide emissions or utility costs, by continually evaluating grid cleanliness, heat pump efficiency, and utility costs, and choosing between the heat pump and furnace-at least in theory. If, at another moment, the cost of electricity is especially high, perhaps because it’s during the on-peak period for a time-of-use rate, the system could choose to run the furnace. For example, when renewables like wind and solar are the dominant power sources on the grid, the system would choose to run the heat pump. The existing furnace would be left in place to backup the heat pump on extremely cold days, but the furnace’s work needn’t be limited to backup duty.Ī benefit of dual-fuel systems is that on a call for heat they can run either the heat pump or the furnace, depending on which one happens to be more beneficial at the moment. When an air conditioner fails, it can be replaced with a heat pump for little to no more cost than buying a new air conditioner. Known as a dual-fuel system, it combines a heat pump with a natural gas furnace, and it’s an inexpensive way to electrify existing homes(at least partially). The heat pump tax credits in the Inflation Reduction Act may well lead to a surge of installations of a type of heat pump system that isn’t exactly new, but hasn’t been widely used so far. Additional details may be found on your utility's website.Check out my latest blog post titled: When will we get the heat pump thermostats we need? Your program details may differ based on your utility.
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