Sounds like your furnace is bigger than was necessary. Do you have any
indoor air quality issues?

If your air quality is OK and the humidity isn't swinging wildly then it may
be OK.

"Mike" wrote in message
news:y32bh.42$hn.26@edtnps82...
This summer, I upgraded my walls to R20, attic to R40, replaced metal
single windows with double low-e argon vinyl, replaced all wood doors with
insulated steel, air sealed the house and replaced a 30 year old 120k gas
furnace with a 75k condensing unit. The old furnace used to run every 5
out of 15 mins at 0C, now it runs 10-15 mins every 3-4 hours. Something
doesn't seem right here as my neighbors runs 2-3 times per hour and it's a
100k furnace in approx the same sized house with similar insulation (maybe
20% less) I have my tstat set to +/- .5C and CPH disabled.