While Rhode Island Energy will subsidize smaller improvements (e.g. a new Google Nest Thermostat is $75 off), RI and RISE can either directly subsidize or provide you with the info to subsidize new windows, solar, blow-in insulation and more.

I would definitely install a smart thermostat asap!

If you can't self manage (which everyone thinks is easy - but it's a LOT of work so depends on your available time to devote to answering basic questions over and over, calling 3 cleaners to replace the one that called out for the 5th time in season, calling an A/C company because your guest turned the thermostat down to 65 in 100 degree weather, etc.) then either go with iTrip if they have a strong franchise in your market or a mid-size local company with a good reputation.

Upgrade to Smart ThermostatsTech-Savvy Improvement: - Install a programmable or smart thermostat

I just ensure my first floor tenants keep the thermostat at 68 degrees from 6am to 11pm and 65 degrees 11pm to 6am (NJ Law). 

Water Heater Not Producing Hot Water   Quick Fix:     - Check the thermostat settings

Its gotta be a dual zone system, then the FAU actually operates as 2 separate HVAC systems. 2 thermostats etc.

I currently have my multi-family as a double Airbnb and have thermostat and electrical panel in the bottom unit.

They asked about lowering the rent in the winter , I told them its better to lower the thermostat 

I would also talk to a professional about where to set a thermostat (google says it should not be more than 85) and I would approach it as a good-faith you were checking her concerns: "When I came by the other day I know we had briefly spoke about the furnace, so I reached out to a professional and they stated to not set it above ____.