What home automations (wifi door lock, smart thermostats, etc) are your favorites?

It has steam heat and the thermostat is in the basement in the next room over from the boiler.

One thing people failed to mention is that alot of new thermostats can be accessed remotely and alert you when the in unit temperature drops too low.

Property manager here, but I feel like I can add a little value here: We use Lynx for the home automation (locks and thermostats, pool heaters coming soon). 

Turn the thermostat to 85 degrees make sure working properly.

Make sure the thermostat is in your living area.

Other than the door being destroyed, the tenant purposefully destroyed all of the blinds, dumped rice, confectioner's sugar, and pancake mix everywhere in the apartment (carpets, yuck), and turned the thermostat down on the refrigerator so everything would spoil. 

Then the furnace / hot water heater / zone valves and thermostats in all units. 

The thermostat went out about a week ago, sent someone immediately to replace.

.- the cost of having this done could be a huge burden. get a few quotes, then weigh them with the option of just increasing rent to "market rate plus heat" (water is USUALLY included for tenants in multifamily properties), and consider adding nest thermostats throughout so that you can control the max temp.