For me it would be The master key system from Charles F Haanel.Its an intesive 24 weeks course, focuses on improving your visualization, developing rare insights and over all self development.

Am looking for more cost effective system to bring down trash cost.

And I rarely get it.My best deals come on HUD deals where I tend to catch houses that pop back up into the system or where there is a price drop.

Remember you don't have to own a property to control it.Good luckPaul

But, it could also be the heating system was undersized for the structure when it was last replaced.

I have documented similar savings in dealing with HVAC systems.

While you are heating and cooling more space if the system is designed properly, the building envelope sealed, and the building properly insulated then the high ceilings are not that much more expensive to heat or cool than the conventional space with 8 ft ceilings.Old heating systems are designed to fill the room with hot air.

for a newbie ..the best property is the one that you can access as many times as possible before you close. having the property under contract and "acting" as an owner, contractors will talk to you ..you can get bids, quotes, do inspections, termite letters, radon tests, mold test, etc ...imagine bringing army of inspectors when an owner still lives there ..not possible. you control purchase price ...so make sure you factor all things you need to change, add, update into ur costs ...u need to discover as much stuff as possible. once u do 10 flips ..probably short 10 minute walk will be enough to get u rough idea ..but by that time ...inspect, inspect, inspect

Most MLS systems have a method by which brokers can enter comments or opinions about what a client thought about a property when they visited it.

It's all about controlling the cost.Good Luck!