Answers

Bee spray typicaqlly has a really far reach or an exterminator. 

I believe Home Depot has some aerosol products that can nearly reach 40 ft, but not positive.

A tankless water heater can certainly be installed in a condominium - similar to any other structure. The easiest model is one that mounts externally - typically near the highest use of hot water or midway between multiple usage points. If there is some distance between the use locations, you can also install a D'mand pump to "call" the hot water so you are not wasting water waiting for the hot water to arrive. If you install a unit on the interior of your unit, e.g., in the previous water heater closet, the unit will require venting.  And - FYI - one reason people love to install an on-demand is that you can actually repurpose a former water heater closet creating more useable space in your condo.   One last piece of important information, you will need to check the size of your incoming water line.  Typically water lines are 3/4 inches in diameter.  On-demand units require incoming water lines of one inch.  So you may need to upgrade your plumbing to accomodate the increased size of your incoming water lines.  I hope that helps.

Vinegar deluted with water is safe and works well.  Bona is another product that works.  Do NOT steam clean real wood floors with a steamer or use pine sol!!

Spray insulation foam close cell.

Spray foam insulation is by far the best for an attic.  It is sprayed in the rafters areas and basically seals off the entire attic and stops the heat as soon as it enters from the roof.  It can be very expensive though compared to regular fiberglass insulation or blow in insulation.