- Joined
- Dec 21, 2018
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I think Alexander had it correct. Your old ducting is the reverse of what is now used, at least in this area. Warm air would be sent via floor diffusers at the outside walls and under windows. Return air would be high on an inside wall. This reduces the variation in room temperature as the furnace cycles. The poor thermal condition of your house also will cause rapid temperature changes leading to cycling. The hysteresis setting may be correct for a modern house but not one that loses heat so rapidly. Unfortunately setting for a greater differential will result in greater swings that you will feel. Get some storm windows. See if you can seal up any air leaks. If you have a basement insulate the box joist spaces. Next spring put blue or pink foam against the basement walls down 3' into the ground and above grade cover it with some of the fabric/resin systems almost all the way up to the framing. If you are in a termite area use termite shielding, or an inspection gap, or treat the ground around the house so they can't go up between the foam & the masonry.
If you do most of the work except termite treating you will probably recover the material cost in a few years fuel costs. AND your furnace will cycle less.
If you do most of the work except termite treating you will probably recover the material cost in a few years fuel costs. AND your furnace will cycle less.