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[quote=Anonymous][quote=Anonymous]

Thermostat is in our bedroom but it still isn't as warm as I like on these frigid days.

On another vote -- my HVAC tech friend doesn't agree, but I do think the heat pump coupled with the newer building materials is a recipe for disaster. I mean, wouldn't it make sense that the original part of the house, which is brick and plaster, holds in heat better than drywall and siding? 
[/quote]

No, this isn't the way insulation works. A home framed with 2x4's using old insulation maybe achieves a R10 (new fiberglass is R15.) new construction using 2x6 framing gets a R21 rating using fiberglass. Add on that newer construction also tends to use better insulation than the cheapest fiber out there are the difference can be substantial. R values for brick are around 0.5. Fiber cement is about 0.20. Plaster and drywall have basically no insulative value.

Heat pumps with new construction are almost always the most cost-effective and efficient solution. And yes, they need to have good auxiliary heating elements for the 10 days a year the temp drops below about 19 degrees during the day.[/quote]

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