The iComfort 10F81 thermostat died. The screen lit up, but it was just a gray rectangle. So, I bought an Amazon Smart Thermostat on Saturday night and they delivered it Sunday morning at 8:00 a.m. I tried to install it, but I couldn't get the furnace to turn on.
So, I called Energy Works NW and they were able to send Izzy out Monday afternoon, July 29, 2024.
The iComfort was a "communicating" thermostat and was wired like that. Izzy rewired it as a simple "legacy" thermostat because the Amazon model isn't fancy.
The Lennox furnace is a two-stage furnace. The idea is that if it's trying to get to 75 degrees and it sees that it hasn't gotten there in, say, 8 minutes, it kicks on the second stage to get hotter faster. That was the iComfort thermostat's responsibility, apparently, so it could do it all fancy. Izzy configured the furnace to do its own bump up to the second stage. No big deal.
While he was here, I asked Izzy to do an annual service on the furnace--that's $250--and he charged me for 1/2 hour for the thermostat, so with tax it came to nearly $400. He would have sold me a $40 filter, too, but he didn't have one. I bought two 16254, MERV 8 filters for $50 at Home Depot. I'm not sure how often I should change the filter, but the old one (which might date to 2017) was pretty dirty. (By the way, a 16254 filter is 16" x 25" x 4"--mystery decoded.)
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