because of my high energy prices and the temperatures in my office

it is not possible to mine vtc
Really?I leave at Southern Europe (35ºC its the normal daily temperature) and my gpu's are at 70ºC. I use a fan! A domestic one

C'mon, electricity costs may be an issue, but unless you leave at Middle East high temperatures shouldn't be a problem

Agreed. I have my rigs in my garage in Texas. You just gotta get the air flowing in the right direction with box fan(s). Mine haven't gone over 83 or 84 C even when it's up to about 45 C in the garage...