Seal the reflector it could save u about 5-10 %F on the temps. Either make one or buy one, check the FAQs. I made one and it saved me about 5-10% thats the best it did for me. Just make sure ur exhaust is on top and fresh air intake is on the bottom. If an A/C is available in ur room do it cause it can save u alot of work and trouble in the end.