Partly because it is business and partly because I want them to be able to keep their lives together in this disastrous climate.

Heating is a basic habitability standard in cold climates, but in most areas air conditioning is not.

These are the traditional more rural facilities that are non climate controlled, garage style in a row facilities.Class B or Second Generation is similar to Class C but climate controlled. 

We normally use 20 dollars per bedroom per month here or 50 dollars per unit whichever is greater, but there are many factors from climate to how well the property is insulated to the effiency rating of the boiler.

Best to check with the utility company or count the electric meters - if there are more meters than there are doors you probably have to pay something to light/heat stairs, halls etc. each month, especially in a climate with below freezing temps.

@Lucas Carl The only tenant I ever had that rose to that level of crazy was NPD (narcissistic personality disorder); he actually told me that-- and I believe it because he had all the symptoms.

To not only lose that situation, but add a turnover and vacancy cost, additionally during the current climate is a poor financial move.

I suppose the same could be said for really hot climates.  

My small management company currently has a few dozen units under control and even with this small sample size we are seeing the direct affects of local Philadelphia climate which through City Council and local news outlets seems to be begging tenants not to pay rent.

Typically the less affordable markets have appreciated more because they have multiple of the following: population growth, diversified economies, nice climate, housing constrained, rising incomes, large variety of entertainment opportunities, housing shortage, high paying jobs.