The tenant responded saying that the unit is "very cold" & "uninhabitable" half the day during the winter & doesn't think paying an extra $25/month is reasonable & said that when he used a space heater the previous owner gave him a discount on rent due to tenant paying higher electric bill(I would loose money each month if I did this).

I'm not saying that automatically discounts their point of view, but it IS something to think about.Hell, I'd buy it from you if you'd sell it to me at your cost.  

Their contract listed rent as $100/mo discount to the desired rent for mowing grass.

I have a guy at a local appliance store and I am setup with contractor discount.

I will have to evict/not renew month to month lease for the tenants so that will give me 60 days to gather materials for my contractor and try to get some sales/discounts on stuff.  

I am looking at a duplex with no repairs needed but the numbers look good and is about 15% discounted.

At that discount I just may be able to fix this then.

A few ideas, all of which require research and feasibility assessment as they depend on local regulations and/or affordability / demand in your market:1) add additional lots by developing unutilized land2) add storage space / shed for residents to rent for a monthly fee3) offer a cable or bundled cable / phone / technology package to residents; buy services at wholesale rates and sell to residents at discounted retail rates4) adjust rents based on size / location / views/ambience of lots in the park5) bill back water/sewer/trash, where applicable 6) offer billboard/advertising space if your park has decent traffic visibility7) lease space on property for cell tower operator 8) cut grass on residents’ lots for a fee9) paint/wash/skirt homes of residents for a fee10) fill vacant lots / vacant land with area for long-term parking for boat/RV/equipment 

I want to get something pre-MLS with a nice discount.

"Long Distance Real Estate Investing" by David Greene (They have used copies on Amazon for a discount and it is available via audio book)-This book will set the foundation for out of state investing.