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Mismatched Heat Pump Units
In Oct of 2020 we’d had 3 minisplits installed in bedrooms that the central ducted furnace never quite kept warm, and we’d been very pleased. That set included Mitsubishi‘s MXZ-3C24NAHZ2-U1 outdoors,…
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Verifying Heat Pump’s Energy Efficiency Performance
High energy usage - how to verify efficiency of a heat pump - Mitsubishi ducted central system issues and have a ductless multisplit I am interested in knowing if it…
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Single Air Handler vs. Multiple Ducted Minisplits
We're doing a new construction project in Portland OR (Zone 4C), and I am deciding between using 2-3 ducted PEAD systems or a central SVZ-type air handler. I've read John…
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Cold-climate heat pump reliability
Please share your experience with cold-climate HP reliability. We are doing a major energy retrofit of a 1975 ranch home in northern Colorado (CZ 5B), for year-round comfort, resiliency and…
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Energy retrofit: HVAC strategy?
I'm planning an energy retrofit/remodel of my 2000SF single-story home in Dallas TX, involving substantial insulation upgrades and thorough air-sealing.
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Utilizing central forced air in fan only mode for ductless heat pump whole house air circulation?
I've recently added a Mitsubishi Mini-Split (MSZ-FH18NA2) to our old (1870s) but decently renovated and well insulated 1800 sq ft. house (1100 1st floor, 700 upstairs) Sometime in the late…
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Conditioning Second-Floor Rooms With Air-Source Heat Pump
We are looking to replace our existing gas-fired furnace with an air-source heat pump, and are running into some of the common problems with heating/cooling the second floor in old…
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Ducted heat pump retrofit
We have a 1200sqft, single story (with basement) in Zone 6 (northern New England). Built in the 1950s, it’s been upgraded with insulation (R60 attic, blown fiberglass in the 2×4…
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Do I really want a ducted mini (vs ductless)
Should I believe in ducted splits?Quite a few respectable voices on this site advocate for ducted heat pumps over ductless. When I tell local installers I would like to consider…
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HVAC retrofit options
I would like to replace the HVAC system on my zone 2B low desert house. The house has a 20 year old gas pack (a roof- mounted gas furnace with…