A normal purchase will allow you an option period to have a full inspection which includes looking behind the electrical panel , under the home, in the attic etc. from there if your inspector sees something of concern they will include that on your report and from there you can get second opinions from a plumber, electrician etc. this is always my biggest concern for first time investors who buy from wholesalers - no inspection, all cash, many times inaccurate repair and ARV figures and no one in your corner.

I also have a 16 panel solar array that's 5 years old that I could sell components of for maybe $5k with inverter batteries etc.

That would kill solar heat gain from windows.But if you haven't switched the vents for summer, yeah, that's normal. 

Working through solar panel issue (hopefully).

On exterior walls, look for signs of water damage and any major cracks.For electrical, mainly look out for old knob and tube wiring, fuse boxes for the electrical panel, and if it's a regular panel with circuit breakers open it up and see if there's any space left to add onto it, say if you want to add a dishwasher or need it for something else in the future. 

Hi Sarah, I have split the rent with tenants, and you are right it's not easy, however adding an additional fee to the rent to include the cost of heat or possibly installing electric baseboard heat in the units (contact an electrician to confirm the price of upgrading panels and installing) may be an option. 

The location of the existing gas meter, electrical panel, and water mains along with how long the sewer line connection to the street will be.

This house's basement was flooded to the ceiling, submerging the oil burning furnace, heating oil tank, security system panel, electrical panel, and water heater. 

Over all it was ok but the refractory panels are cracked and the grate is broken.

Rehab Construction:R-19 or higher wall insulation (except for in the Deep South)Insulated sheathing or right foam boardIf the walls aren’t T-19, HVAC should be SEER 14 (at least) and 95% AFUENew Construction:R-19 or higher wall insulation.High quality windows such as Energy Star, U-values (in the North), and Solar Heat Gain Coefficients (in the South)Who can claim the tax credit?