There are more details but I tried to summarize to make it an easier read.

This is not meant to be biased, but you will find it surprisingly hard to discuss fine project details and give important direction over cell phone with someone whose English is not good.

There is a meetup that @Charlie MacPherson runs, he'll jump in and give you details. 

Details, Home is Mortgaged for $150,000, Value is higher around $200,000.

Even if you decide to switch the nature of the heating system, you should, and still may well be required, to perform this analysis.A detailed heat-loss model will also help you prioritize and plan improvements to the building envelope - such as air sealing and insulation.A few missing bits of information,  which may assist the BP community to provide you with some helpful ideas, include:size and organisation of the building: SFH, duplex, triplex, etc.

It's technically a commercial loan through them I guess, I'm not sure.

But we have a plan to get there in the not too distant future ... my next post will detail my plan , just thought I should leave something to desire on that front before I dive in :) 

The questions I have relate to the details of the transaction (should the loan amount be the original amount, or the current remaining balance?

Start by saving, you technically can invest with no money but it will often be riskier and lower quality properties, it is usually better to just save, especially if you want to purchase rental properties as Rich Dad, Poor Dad implies is the right strategy.

In my area, most general contractors will come bid a potential job for a nominal fee ($75-100, applied to the project if you buy and use them) and take as long as they need to come up with a detailed bid.