I have lots of masdevallias, but one is always looking to grow orchids better. I keep my greenhouse at a low temp of 55 in the winter and then rise the temp to 63 during the day. Right now I set it at a straight 50 but the sun heats that baby up. Only turn on the vents once it starts getting too warm.
Don't give up. It gets about 110F here. I have kept some alive (barely) for almost a year. Peak temp in my grow room was about 90F. Have a wet wall and temp controlled fan installed now. Hopefully it will be cooler.