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Cold Climate Heat Pumps
Fujitsu, Mitsubishi, and Daikin have been making cold-climate mini-split air-source heat pumps for years… check them out! Imagine cutting your electric heating bill in 3 or 4! The Fujitsu 9RLQ is the...
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VS: electricity vs propane — New England style
1 gallon of propane is $2.80 right now on avg in the US says the web. If you assume 90% efficient boiler or furnace, that is how many KWh of heat delivered to the house? 1 gallon of propane has ~91500...
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VS: home heating — heat pumps vs wood (or solar)
There are many in green circles — superinsulated/zero energy home/passivhaus circles — who think that heating with electricity (ideally with an air-source heat pump) is the ideal way to heat a house...
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Some HRV advice
Here is some quick HRV/ERV advice based on our experience so far: - Do ASHRAE 62.2 stuff so you get the right flows to right rooms and size the unit appropriately. We run ours on setting 3 of 5, but...
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Summer with a WORKING hrv – latent vs sensible loads
Last summer our HRV was mostly busted/confused. It was confused by controller wiring and was running in recirc mode where no fresh-air is pulled in. I figured it out using this CO2 meter after being...
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We’d be net zero but…
Our house would be net zero source energy but… - well filters: we avg 54 KWh / month - well pump: 10 Kwh / month - radon fan: 40 KWh / month - 2 home offices: 60 KWh / month - Mitsubishi minisplit: 20...
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2011/12: The year in heating
We have an emonitor gizmo that tracks our home energy use by circuit. One circuit is the air-source minisplit heat pump (the heat and cool in the house). For the YEAR ending April 2012, the heatpump...
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If you are pondering indoor air-quality…
If you are pondering indoor air-quality in your home… I urge you to look into the issue of flame-retardants in furniture — specifically in the foam used in mattresses and couches. Here is an upsetting...
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Concealed duct indoor units for air-source mini-splits**
idea 1) Add a single zone minisplit that directly feeds 3 rooms with only 1-zone via tiny duct runs. Mitsubishi and Fujitsu both have these. I think the indoor unit might fit in the ceiling of a closet...
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