Currently the water heater tanks are 13 and 9 years old, I plan to swap out the 13 year old one as at that age it is a time bomb.I pay for the water and the electricity to heat the water.Is it possible to pass some of the electric bill onto the tenants by installing some type of point of use water heater in the individual units (1 bathroom in each unit).I was thinking it might be possible to keep the water heaters at a very low temperature (say warm water, but not hot enough to have a shower for example). 

I stick with gas for cooking, as the temperature is more easily controlled.

The other straight-line hairlines on both the ceiling and walls are likely the drywall seams that have flexed a bit due to the house settling, and seasonal shrinking and expanding from temperature changes.

Cheapest option, but accessibility to change the temperature is limited since I have to come into the tenants unit, which I would like not to do3) Replace thermostat with a smart thermostat.

Moderate temperature with majestic mountains, wonderful coastline and efficient albeit a little pricey ferry system.

Today it was -18 and my heat pump had error code p3 which is “ambient temperature too low for compressor to run”.

*Temperature* aka hot "hot" these goods are would be my biggest concern.Also, it will cost you at least $200 in gas to go pick these items up.

I hope you have readings on the temperature downstairs and have a statement from the HVAC saying the unit is in good working order.Lastly, you are going to need a good attorney and it is going to cost you some money.

After several days of cleaning and not being able to put a dent in the smell I realized it would get better and worse to humidity and temperature.

We had several days of single-degree temperatures here in Connecticut this past week, and a squatter broke into the basement of an 8-unit apartment building that we manage.