What integrated would you recommend for summer amp?

I’ve been very pleased with my Bel Canto C5i. It’s class D so puts out very little heat. They list new for $2K but I bought mine as a dealer demo for $1,200 a few years back. They should be less than that if you find one used.

BTW, it was a replacement for a tube amp (Image 65i with KT88s). I kind of miss the glow of the tubes from time to time, but I have nothing to complain about with the Bel Canto's sound. It is excellent.

Audio by Van Alstine SET 120 Control Amplifier, a little over budget at $1199. https://avahifi.com/collections/power-amplifiers/products/set-120-control-amplifier

I use an 845 SET amp yr round without issues.   My AC does not run more or harder when the amp is on.  

Has the OP moved a reading chair closer to a window so less electric light is needed while reading ?   

Has the OP considered how many times a day he opens a refrigerator or freezer door ?    

Has the OP considered how much ambient heat is added to a room when cooking food ?

Does the OP use a smart thermostat that can be set run the AC less when people are are away for several hours ?

Lots of other things to worry about....

Wow!  What a concept!  Wheee!  An audio store's wet dream, seasonal amps.  I use two Audire powered systems and one Bryston powered.  All I need is to set up my old Adcom and I can have a system for each season.