Visualizing mini-split performance data - GreenBuildingAdvisor I sanity-checked against Jon Winkler’s 2011 report, “Laboratory test report for Fujitsu 12RLS and Mitsubishi FE12NA mini-split heat pumps”, and various real-world monitoring studies (Roth et al 2013, Faesy et al 2014, Ueno et al 2015, Williamson et al 2015, Korn et al 2016, Sutherland et al 2016)
Fresh air with heat pump or minisplit - GreenBuildingAdvisor This is why “mini splits” are so confusing! A ducted heat pump can be either traditional or a minisplit The indoor unit isn’t what makes something a minisplit, the outdoor unit does I’d recommend a ducted heat pump and I’d run ducts to the bedrooms (and all rooms if possible)
Undersized Minisplit Heat Pump - GreenBuildingAdvisor Cooling performance in the heat wave You can see from the numbers above that my house has a cooling load of about 21,000 BTU hr and the heat pump has a cooling capacity of a bit less than 19,000 BTU hr According to those numbers, my heat pump has only 88% of the capacity it needs to keep my house cool on a design day
Mini split head – mounting location considerations In cooling dominated climates, the best the place to attach the indoor "head" of a mini-split heat pump system is in a mechanical closet, connected to ductwork That is to say, I think it's a BAD idea to use ductless mini-splits for a whole-house application in a cooling dominated climate
HVAC – Gas furnace vs. heat pump vs. ducted minisplit This leaves the choices of: ducted mini-splits (3 heads), 3 zone split system heat pump, or 3 zone high efficiency gas furnace with piped outside combustion air intake Any system with have an independent ERV There will be a base charge for natural gas service no matter what per item 2 above
Oversizing a Minisplit Heat Pump System - GreenBuildingAdvisor There's nothing quite like a right-sized heat pump In zone 5b, have 28 6 kBTU heat for 2,100 sq ft with three ducted heads Heat load calculations (required for HERS) appear accurate and align with utility bills I spot filled a few air leaks, made appropriate filter choices (type and size) and insulated the air handlers Heat pump handles
What is a Minisplit? - GreenBuildingAdvisor In that sense, a minisplit is just what its name says it is: a small split-system heat pump Where it gets confusing is in the different ways manufacturers make these lower-capacity, split-system heat pumps A minisplit, for example, can have a conventional fixed-capacity compressor or an inverter-driven variable-capacity compressor
What’s the best wall height for a ductless mini split heat pump? I’ve been heating my home with a Mitsubishi Hyper Heat FE-18 heat pump for over a year now and learned a valuable lesson about which wall to place the unit on I “hid” it on a partition wall, 90 degrees to an exterior wall, and place it up over a wide opening (8 to 9 ft opening) from the LR to the DR
Combined HRV and mini-split - Green Building Advisor Are there commercially available units which combine heat-recovery ventilation with an air-to-air heat pump? I'm imagining something that could transfer heat from the exhaust duct to the supply duct of the HRV as needed during the heating season and vice-versa in the cooling season Heat transfer within the HRV would be wholly conventional and the additional heating cooling would be introduced
SANCO2 Heat Pump Water Heater - GreenBuildingAdvisor It does kick in to resistance mode for the 10-15 days per year it gets close to freezing outside, but the rest of the time it's only running as a heat pump I suspect that with the innovation happening in the heat pump space now, we'll eventually have traditional format HPWHs that - like the SanC02 -don't need any resistance backup heating