In my gig as volunteer, I swear someone told the garbage bags to be fruitful and multiply.

Just take the 5 I sent over and multiply by 20 and let's see where it comes in. 

Then multiply that number by 1000 and that will give you debt amount current income will cover.  

basically, what you need in btu for each unit can be calculated by multiplying the square footage of each unit by 3.5. i. e., a 1000 sq ft unit would need a 35,000 btu furnace at minumum. then you have to consider the distance from the furnace to the unit is services. if the building is a 3 story with a couple of apartments on the top floor, then those units should have at least 10,000 more btu than the calculation calls for. if each unit has the furnace within the apartment, then the calculation is what you go by. most systems are pretty much the same, but, just like a car, there are some brands that simply cost more to repair based on parts and such. trane seems to be among the most expensive. i recommend goodman. easy to install, easy to work on and parts are reasonable. no one can calculate the timing of repairs on any unit. i have seen 3 year old furnaces need work and i have seen some go for several years without an issue. too many variables to figure that out. if you are talking about having one unit for the entire building, same formula applies to the sq footage, however, i would not recommend this because inevibly, some apartments will not get as much heat as others, and with one furnace, you cannot control the heat going to each apartment. a boiler system could do that but if you don't already have one, it is going to be massively expensive to have one put in. in an inspection, look for the age of the furnace, this can be found in the model number in most furnaces. usually the 1st and second digits are the month it was build, and the 3rd and 4th is the year. however, this is not on all furnaces. basically, get the model number and look it up on line. anything over 15 years old is probably on its last leg and about as fuel efficient as a campfire. also, look for how clean the furnace is. if it is dirty, chances are it hasn't been service often enough. i would have it cleaned out at least once every 3 years at a minimum. change the filter at least once a month, especially in the winter months. a clogged filter not only can lead to premature damage to the heat exchanger, but will also effect the output and efficiency of the unit and could possibly poison your tenants with co2 gas. i hope this helps you, please let me know if you need any further assistance

So, take the prospective mortgage payment (PITI) and multiply that by 6. 

You have made Jill and Robert way too rich already; let us stop donating them money--YOUR HARD EARNED MONEY.For our clients who are applying for Line of Credit, please note that the minimum LOC amount you can get approved with isn’t $1,000,000 but your current liquidity multiplied by 7.

@Jacob Lapp ideally you put your money in a stock, don’t look back until 2-10 years later where it’s multiplied many times over.

It was easy and tenant was happy.They multiply quickly and I didn't want to deal...

Land value there has multiplied many times over ever since becoming a shipping and financial hub in southeast Asia.

If we take P&I and multiply by 12 payments then divide that number by our investment we will get yearly ROI?