Acceptable Temperature Swing?

[fragNplug]

I see 1 deggre shift in my tank, using a 1/4 hp chiller though with a aquacontroller JR.
I do find though that the chiller heats up my livingroom a bit too much if i have all the windows closed.
Then it creates a cycle.
The hot room heats the tank the tank needs to be chilled the room gets hotter untill i get too hot and have to open a window.
Hope this winter my windows dont freeze up with moister like it did last year when i was running a cooling fan.