Oversizing a Minisplit Heat Pump System - GreenBuildingAdvisor
Aug 5, 2021 · 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 ...
Visualizing mini-split performance data - GreenBuildingAdvisor
Mar 14, 2019 · I made some graphs of the capacity and efficiency of these ductless mini-split heat pumps. I figured I’d share the graphs here, since many GBA community members are interested in mini-splits. Take-aways. 1. Capacity and efficiency depend on the indoor and outdoor air temperatures. (See graphs #1 and #2.) 2. Efficiency also depends on how hard ...
Surge Protection for Heat Pumps - GreenBuildingAdvisor
Jan 13, 2021 · Fortunately, it’s easy and inexpensive to add surge protection to a heat-pump system. This article reviews causes of power surges, explains how surge-protection devices work, and discusses installation, service, and sales of HVAC surge protectors. Causes of power surges. Residential heat pumps typically operate at an incoming voltage of 230 ...
Mini split head – mounting location considerations
May 11, 2016 · 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.
Heat pump / mini split recommendations - GreenBuildingAdvisor
Mar 3, 2024 · I got 3 quotes a year ago for ducted heat pump or mini split systems ranging from 36k to ~50k excluding Mass Save’s rebate. Based on what I’ve read here, those systems were oversized (2 3-ton ducted systems, or mini splits in every room). I thought the estimates were too high and ended up spending the money on solar panels instead.
Output air temperature of mini splits on heat?
Feb 15, 2016 · Output air temperature of mini splits on heat? I have a little experience with heat pumps and gas furnaces, and have always noticed the difference in temperature of the air coming through the registers. I read somewhere that heat pump air temps are usually 95* where gas furnaces get the air temp up to 115*. I have looked around but can’t find ...
In-Floor Radiant Heat vs. Cold-Climate Heat Pump
Feb 28, 2022 · Built a HERs 30 house before PV, ACH .6, R-15 under the slab, mini split heat. Ceiling temps are 70 degrees, 68 degrees at eye level, and slab is 55 degrees. House is draft free and comfortable but floor temp feels cold. A more recent project combined both radiant floor heated by air to water heat pump, with standard air to air mini splits.
Split-System Heat-Pump Water Heaters - GreenBuildingAdvisor
Feb 6, 2015 · In Japan, heat-pump water heaters are configured differently; they have an outdoor compressor rather than an indoor compressor. (The outdoor units of these heat-pump water heaters resemble the outdoor units of a ductless minisplit.) This type of air-to-water heat pump is called a “split system” heat-pump water heater; it is designed to ...
What’s the best wall height for a ductless mini split heat pump?
Oct 27, 2014 · 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. I thought the air circulation would ...
Mount outdoor unit on the wall or on the ground?
Jan 18, 2017 · I am close to installing 3 fujitsu mini split units at our home under construction. Two outdoor units will be installed near each other, with the third installed in a different area of the house. The HVAC installer asked if I wanted to mount them on the wall or on the ground. I can't decide which I would prefer. Any thoughts on the pros and cons of each? I live in central KY, …