I use Lamm M1.2R for Winter and Lamm ML2.1 for Summer.
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Yep, I have a Cary Sli-80 F1 for winter and a Simaudio I-5 LE for summer. Same thing in my office, a Jolida FX10 tube amp in winter and a DIY chip amp in summer.
I just made the switch to the summer amps two days ago. I moved back to Austin, Texas, a few months ago and hoped to get to May 1 with the tubes before they had to start battling the air conditioner. I used the same system in Seattle, tube amps in the long, cool fall/winter/spring and solid state in the summer in a house with no air conditioning. (The joke in Seattle is that there are two seasons, winter and August.)
Beyond the comfort and economic considerations, it's interesting to hear again the differences between the amps.
I have the Rowland 625 for listening September through June.
I use the NewClear amp in the summer.
Here in Phoenix, this is a necessity. My 625 keeps my living room 2.0 to 3.2 degrees warmer than the rest of the house, according to my atomic clock & the remote sensor that came with it.
Last August, we had a record 116 degree day here. My A/C was running 26 minutes on & 10 minutes off, to keep the house at 77 degrees, at 3:00 in the afternoon.
I really appreciate my ICE amp, when it is hot out!
In the past, for multiple reasons, I tried cooler SS amps during of the hot summer months. I was rewarded with a much lower air-conditioning bills. That experience made me miss my room heating, 10 tube per channel power hungry amps. I quickly sold the SS amps and resigned myself to extra heat and higher electric bills. On the plus side my thermostat is located adjacent to my listening room, so it's pretty cool in the remainder of the house. FYI: I live in the Great South West Desert, where the Summer temp's reach 115 degrees for weeks at a time.
I also live in Austin (Hi SVAR!) ... I do remember when I had only the old high bias Rowland M7... So hot that my 2nd floor music loft was unusable from June through the end of September.
In More recent times, during Summer I have been using mostly the cool running class D Rowland M312, except for Summer 2012, when I was running the fairly warm class A/B Rowland M725 monos. Winters have been on Rowland M625 or M725. But coming summer I hopefully will operate the new Rowland M925 monos, which -- I have been told -- generate little heat.