I am having a 2 ton Carrier Infinity 17 heat pump installed in the next few days. I am a bit concerned about the lack of clearance between the heat pump and the surrounding deck and house. The unit I am replacing is about 24" x 27". The Infinity is about 24" x 37". The area that the new unit will be installed is about 40" x 40". That doesn't leave much air space around the unit. The installer does not think this will be an issue, but I am wondering if there are any general guidelines for the minimum amount space around the heat pump?