Simple repairs can take a $2 part; like the flapper in a toilet tank, the outdoor porch light, or the batteries in a remote. 

Either that or write a letter to Energizer or complain about the cost of batteries in 2017.

@Michael Carbonare  Glad to see you got new batteries in the pace maker!!  

Ever since then my spare time and iPhone's battery has been devoted almost entirely to Redfin. 

Basically, battery powered drill, pliers, hammer, pipe wrench is a good start.

The batteries alone cost $7000 and probably have to be replaced every 5-10 years.

Removing these items from the vents solved the issue.In one other instance the complaint of a unit not coming on was solved when we replaced the dead batteries in the thermostat. 

It is battery operated and can be secured in many ways.

My guess is that the roof is flat; and solar panels should be angled a bit facing south I believe, so you might have to add some structure for that; then you would need an inverter, and you might even want a bank of batteries for storage (and maybe not since you can sell excess generated electricity back to PECO).

I also inspect plumbing to assure there aren't any leaks, maybe filter replacement, co and smoke batteries.