Yeah...I am sad to say I hear you man. I recently had to down grade myself due to space and power bill ... I would not run the two old boxes - unless they have big GPUs in them, probably honestly not worth the money. The old rigs can really suck down the juice for a pittance of return in credits. I know, because I did an analysis on running an old P4 rig that I had...it literally wasn't worth it to turn it on. Maybe time for a little Craigslist action?
Also, if the A/C is just for the rigs...I would totally shut it off and just drop all O/C on everything, and it should be able to run pretty well at ambient temps. Just my thoughts, and sorry to hear about the news.