HVAC question — live in and flip scenario

[Matt Ferch]

Hello, I would like to get some advice on the best way to approach an HVAC situation.

- My girlfriend bought an 800 sq ft condo three years ago. The plan is to sell it before the end of the year.  

- Some work has been done (flooring, carpet, doors, paint, etc), but there is more to do (sliding glass/screen door, kitchen update, bathroom update). 

- Last week, the A/C went out. Unit dates back to 1992.  

- All in, she has $50K invested. Based on comps, we believe ARV would be approximately $75K.

Question #1: Given the age of the unit, we feel it would make sense to replace it.  Do you agree?  Is that how an investor would approach it?

Question #2: If we replace the unit, what advice do you have in order to do it cost effectively?

Thanks for your help!

Matt