I have an in wall air conditioner in my living room (where my tank is) but I've always had difficulty balancing the tank temp in the summer because like most in-wall air conditioners there is no real control. I have to turn it on or off manually. Which causes difficulties when I'm away.
Last year I got a little smarter and put it on a timer (to come on during the heat of the day and off in the evening) but that still isn't the best solution because the tank would get too cool when the weather didn't heat up the house.
This year I managed to find a plug-in thermostat and Canadian tire. I works great! I set the temperature and it comes on and off as needed. It was 38 degrees outside yesterday and the combination of the air conditioner and fan across the sump kept the tank temp steady at 79F all day.
I can't find a link to it but it's built by Noma and you can find it in with the light timers. I think it cost $25. It works so well I bought a second one for my portable air conditioner. I now no longer worry about the wicked fluctuations of temperature I get in my tank (especially when I'm away).
Cheers
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