What kind of 600W hps setup are you using that you are finding it hard to manage the heat? The biggest misconception around here is that LED's do not put off any heat. They will definitely warm your space up and especially in a sealed area grow.
You sound like a similar setup to what I have going for flower - a 5x10 smaller room build within a bigger space. Basically a constructed tent with real doors.
I manage 2 1000W HPS lamps with no cooling issues and never run A/C, up to 1150 watts mid flower at times. I do however run vented hoods that the naysayers like to bag on so much. It's all a trade off - some put the wattage into their environmental control, I'm laying it down in the lights with a single 80W fan handling the cooling.
Also, to check out some straight scoop on led growing with the successes and woes from someone who actually has used both and doesn't sugar coat things check out some of brother
@hybridway2 's threads. Just be warned he will most likely let you know how much he likes Amare.