On Jan 5, 11:40 am, ransley wrote:
On Jan 5, 2:19 am, "James Sweet" wrote:



wrote in message

...

My thermostat runs my furnace about once every hour when it is 20
degrees and I am thinking about adjusting the swing on the thermostat
to a lower number so that the system keeps a more consistent temp. Is
this going to cost me more in gas. The swing will allow the system
(set at 62 for heat) to come on at 61 and run it up to 63. So the
swing is 3 degrees. I figure I might go to 2 or one to cycle the
system more and be more consistent temp. Any thoughts?

Give it a try and see what happens. It sounds like your furnace is oversized
though, ideally on the coldest days you ever see, it should run nearly
constantly to maintain the desired temperature, though 61F is much colder
than usual, I would size it to maintain 70 so you have a bit of margin.

It might take 5 minutes for the furnace to get to full efficency,
running once per hour is not much 61f and a 3f swing for me is
uncomfortable, 10 minute running cycles are short but I dought you
will notice a difference narrowing the cycle

the cycle runs about 12 mins. and yes the furnace is too large by
about 30,000 btu. Not installed when I was living here. Wil there be
a diff in usage of gas though. I can go to lower setting on this
thermostat, even though there is 0 swing right now. When I checked it
said 0 swing at 63. Went to -1 and it dropped to 62. So I assume
that will keep it right on the mark of 62? Obviously dont want to go
lower than the set temp though.