HVAC and Related Expense Budgeting

It's possible that most don't get this detailed. However, I was wondering what the magic financial budget formula (e.g. ratios used per unit) might be for apartment managers to budget the following (even in a general category):

• hvac maintenance
• hvac standard parts repairs
• hvac - entire system replacements
• hvac tenant work order calls (maybe that's part of repairs)
• hvac related floods or mold repair

Other Questions
1) How big a problem is mold in apartments with tenants leaving windows open?
2) How big a problem is floods from hvac condensation line backup (coil freezing)?
 

I'd be glad to speak with you and share some thoughts and insights. There are so many variables that must be considered which is why you won't really find a "magic formula" or specific ratio or cost per unit with an extensive history, but I am certain I could help in a short conversation if you like. Let me know!

Hi Alex, I sadly have yet to find a magic formula for anything in multifamily, but I may can add a bit to this conversation nonetheless.

My best advice to anyone budgeting for HVAC would be to stay up to date with EPA regulations. Buying at the right time can really save a ton of money.

Windows being open constantly and the problems it may bring varies greatly on the location of the property. Dryer climates wouldn’t be such a problem. Humidity is everything.

Invest in condensate drain float switches. Install them at turn. Clean evap coil at turn. There’s no reason to have constant floods from the air handler.

Hope this helps!

Alex,
Most of the answers are property specifics. Local codes/city/state requirements can influence the answer .

Answers to other questions:
1) It shouldn't be a problem if they are running the air conditioning systems while the windows are closed (unless windows are open 20 hours a day) If they aren't running their A/C, moisture in the air can cause a major mold issue even without having the windows open. This answer applies to locations where humidity levels are on the high end. In dry environments, it may not be as big of an issue.
2) If immediately addressed and properly drying the area, it wouldn't turn into a problem. The other way around-problem.