Reply to Cost of Adding HVAC in attic of old house?

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[quote=Anonymous]A mini-split often works well in OP's situation.  That likely is lowest cost option. Not all HVAC companies are equally trained on mini-split installation, so shop around.

If there is existing viable upstairs forced air ductwork, then one would need to detach that from the downstairs zone and close off the connection thoroughly. In that case, I would pay to have all the upstairs/attic ducts resealed with aluminum tape (not duct tape) at every seam to minimize cold air loss to an unconditioned attic.

Because the house is so old, the roof planks likely are bone dry. That means another option would be to close off the attic (i.e., no vents) and have spray foam insulation put under the roof planks and along the eaves, also removing any insulation from the attic floor.  This makes the attic conditioned space. We did that and it was a huge reduction in both heating and cooling costs. It also meant a conventional heat pump blower unit could be put in the attic of our 1963 colonial. [/quote]

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