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Old 10/29/2020, 05:02 PM   #1
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Join Date: Sep 2012
Location: Toronto, ON
Posts: 264
Odd Temperatures

Hereís an odd one.

System is 70gallon net with a 65gal DT on the main floor and a 40gal sump in the basement furnace room.

Have digital thermometers on a reef keeper - one in the sump to control the system heaters( also in the sump). And one in the DT as a reference.

During the day, when the house thermostat upstairs is set to 70f the display is always 1-2f cooler than the sump.

At night when the thermostat in the house is set to 64f, the temps in the DT and sump are the same.

I canít figure this out. If temps are stable overnight, why the variation during the day?

Any ideas?

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