Keep some Naloxone in your vehicle, along with jumper cables and an air compressor."

Trying to figure out the “real” cost of installing a new central AC unit and replace existing old furnace.This is in San Jose, CAHome is 1600 sq ft - 2 story Got quotes that range from 8.5k to 15kI guess the need is a 3.5 ton compressor and a 2 stage energy efficient furnace.

When the tech came out to look at it, he said the AC compressor, heater and "coil" were mismatched. 

So a 10 unit building, 5 up/5 down, is probably looking at about a 60x60 building footprint, minimum, plus common area, plus compressors/utilities, plus parking for whatever mandate is in your zoning (2 per unit, or maybe more).

Also depends on how expensive it is get the electric to where you need it for the outside compressor.  

We look at water heaters, furnace, ac compressors, roof, windows, appliances, etc...  

Unfortunately, the expenses are still variable and are always unexpected is such properties - the price of a roof, hot water heater, or air-conditioning compressor replacement will be about the same, regardless of market size.   

New equipment just like a new car performs better and has things older equipment does not.The old freezer the compressor,seals, etc. are all getting toward the end of life expectancy.

I strip everything down, PEX plumbing, cheap everything, I do not install A/C compressors, window units only, I do not install the furnace unit I have a deposit.

New or newer roof and AC compressor.