That's a good range. That's where I keep my work room with my servers and computers. Keeping this temperature, and good air circulation, keeps my processors around 85-95 degrees depending on load.
I mentioned circulation. It's important to keep the air in the room moving or else a kind of heat bubble can surround servers / computers and the machines will just continue to recycle their already heated air. A cieling fan does the trick nicely.
It's possible to aquire small air conditioners for server rooms. We had a 1 ton unit at a former company which we got for around $400. It kept the room pretty cool even though we had about 30 servers in a 10x10 room.
Most of today's electronic products undergo rigorous temperature testing as part of compliance with standardized UL or IEC safety regulations. They have a specified operating range they must stay within so I believe parts are designed for maximal performance within that range. I found a source online that said:
Both excessive heat and cold can damage a PC.
Also, another risk you run when you cool the air around computers / servers is static electricity. I'd say to contact your machine's manufacturer / look in the literature provided with your machine to determine the machine's effective operating range. A lot of big server rooms I've been in were kept around 60 degrees so you'd probably be safe in that range.