We have a 32 year old boiler for a radiator heat system in the house.

My tenant complain about every little things from noise I have given notice in advance 1, How do I approach to their complains 2, What is the appropriate time to start the builder to start working in morning 3, I put HVAC on garden unit and 1st unit so radiators were removed. 1st unit tenant wants their floor fix on radiator site ASAP.

There's also the small matter of the blower unit fan (the "force" in "forced hot air") needing electricity.So if you have hot water radiators (water convection will move water) running from a pilot-light using gas furnace AND you can force the furnace on without a thermostat, then yes, you probably can have heat when the electric is out.

@John Bradley you are looking for baseboard radiator covers, they sell them at big box stores but if you have older ones you might have to look around for a fit. 

Yes, there are new regs for 2022 regarding use of criminal background checks for tenant screening, radiator covers for steam radiators, and after July there will be new regs for lead paint testing. 

I would probably do it unless I was keeping/maintaining the existing radiator or HVAC system.

Could be those past bills were estimates and you now have an actual reading that “catches up” on past bills that were too low.Another thing is tenants running extension cords from hallway receptacles to run space heaters inside their units.If you have radiators, you want to keep heat on so that they do not have any potential for freezing up, but you don’t have to keep the temperature higher than say 60F.

Radiation detector or a leveling weight.

Current boilers are30+ years old for the radiator heat. 

I know regional power lines are something I’ve read can be concerning in regards to radiation/cancer.