The work install will not be much, as right now we have standard lights so no new electrical is needed although some might need a new box to support the fan.  

this is the scope of work. the dimension of the roof is roughly 45X151) Tear-off all layers of roofing and gravel down to wood decking and legally dispose. 2) Inspect wood decking and replace all deteriorated and broken areas at $ 2.50 per sq. ft. 3) Inspect existing Ceramic Copings and replace all deteriorated and broken at $ 35.00 Each.4) Install Fiber Cant Strip at the base of the walls and curbs.5) Install 1 layer of Base Sheet over wood decking using corrosion resistant screws and plats. 6) Install 1 layer of Modified Bitumen CertainTeed GTA Granulated. 7) Install Metal gravelstop and gutter flashings at the roof edges. 8) Flash all vents, soilpipes, and chimney using the same Modified Bitumen. 9) Install 5” Galvanized Box Gutter and 3x4 Downspout to replace existing. 10) Pick up and haul away all roof debris generated by Presidential.

I will not need any help with installation, I am just looking for a supplier.

You can have an air condition system installed that uses small duct tubes without having to install large duct work.

Any low costs DIY ideas on how to update this patio wall.

Installing a water heater is super easy if you are a little handy, and even if you aren't with sharkbites.

I should mention, during all this time we didn't have any tenants there yet (we didn't even have water heaters installed yet).

Your ROI, when comparing the two, will give a slight edge to the DIY approach (at least in my case).Possible strategy for DIY portfolios:In the end I think its all about the purchase price and your time.

Blinds are preferred however you must inform tenants in advance that they are not permitted to install Curtin rods.

Don't do the DIY.