I don't know about "none at all" but a Air to Air Heat Pump with a C.O.P. of
3.2 would cost a little less than natural gas to operate, [in most areas
except the extreme Norhtern part of the US] but, may not be as 'comfortable'
as a "natural gas / propane" fired heater. Are you sure your local utility
is not offering any rebates on the +90% furances?

Zyp

"Martik" wrote in message
news:2UVQd.1190$iz2.1034@edtnps91...

wrote in message
oups.com...
1,900 sq ft split level CBS ranch, circa 1964, with a flaky natural gas
furnace, in the temperate Portland (OR) Metro Area.

Time to replace it. Currently, have a Lennox Conservator III G16,
Model: G1603/4-100-3, Input: 100,000 BTU/Hr, Air rise: 35-65 F, and
ducting to match. Only have 5,000 sq ft of lot, and drilling is not
practical, so practicality of a ground source heat pump doesn't seem to
be there.

If you have recently replaced your furnace, would appreciate hearing
how you did it and what you learned.

Thank you kindly in advance for your on-topic remarks. Sales droids
will be spaced, out the airlock, ga-WOOSH!


Payback on a 90+ will be much longer in your area. Upgrade your
insulation, windows and air seal FIRST. You will then need a much smaller
furnace or none at all!