Tenants won't care and run up heating and air with everything else.

Hey, I always include the heat disclosure on my leases.

Oil heat with the tank in the basement but no AC.

I tried some cheap stuff from home depot with adhesive strips on the edges and the subflooring heat made big cracks open up (the vinyl expands with heat and the adhesive softens.

Heating system  needs to be replaced, it used water radiators  with an oil furnace.

Overall, the property is in pretty good condition (albeit is located in a not-so-good part of town, but definitely getting better) and was built in 1950, with brick exterior.Property Price: 325kRents: The property pulls in around 4.3k in rent each month. (1.7k for commercial and 1.3k each for the second and third units).Square Footage: ~5.5kProperty Tax: 8.3kElectricity: 1.6k (included in rents)Water/Sewer: 1.6k (included in rents)Heat: 2.4kInsurance: ~2k (not sure about this)General Repair + Vacancy: ~4.1kAs this is a mixed-use property, I would have to obtain a commercial loan at 25% down, most likely amortized over 20 years.

Replace a control module in central heat unit in a basement that failed because it got flooded. 

One unit did not even have heat - just space heaters.

How much should it cost to replace the main control board for AC and heating system on a 1,141 sq ft SFR?

Im looking at a multi unit and its all now converted to electric heating My concern is acquiring tenants and keeping them .