"We download daily degree-day data from http://www.degreedays.net/ and then total by meter reading periods. Subtract the summer DHW/kitchen loads and then convert to BTU per degree-day per square foot."
"HUGE regional variation in energy prices. Here in Southwest NM, residential NG currently runs $0.655 per therm, with $13.34 in fixed monthly costs. Electric is currently $0.1275 plus $5.63 in fixed monthly costs. All of the above…"
"Lots of complaints from steam and hydronic system owners as well. Looks like a fail with high mass systems in general.
No matter how much computing power and gee-whiz you layer on top of one, a conventional thermostat can only tell the HVAC…"
Kurt Albershardt just added their location. (via No Title)
"Hot water is a lower quality heat source than steam. 100ºF water is a lower quality heat source than 180ºF water. Lower quality heat is easier to obtain and generally costs less.
Designing your emitter system to operate using a…"
"Raising tank temp weekly mostly happens automatically with solar here. No such luck with a refrigerant cycle. In-tank electric resistance elements can easily accomplish that, but the "tankless electric as last-ditch booster"…"
"Heat pumps and solar share a similarity in that maximum efficiency comes from sending cold water to the heat source. Because of this, maximizing their efficiency means not heating the tank directly with the secondary source. Following…"
"The SHPT-50 does look interesting, but I'm having trouble finding out what the actual capacity of the heat pump is (for any of the models, actually.) As someone who designs hybrid systems, I have been recommending tankless electric…"
"An often-overlooked point: Heat pump water heaters remove heat from the space in which they are installed. The warmer that space, the more efficiently they operate. In warm climates, this is a welcome thing almost all year…"
"So much of this depends on the size and orientation of the window. North-facing picture windows are more common than one would suspect, and with our high altitude dark nights, you can really feel the "suck" from the night sky.
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