Simply set the thermostat to emergency heat, and you have heat, which tides you over till the hvac guy gets there. 

Clean common area and collect my washing machine quarters.6 months I change the batteries in the smoke detectors/CO, fire extinguisher inspection/charging6 months I do a plumbing inspection6 months I do a thermostat battery changeNovember I do a radiator bleed.None are done at the same time and I do a complete walk through when doing.My buildings are across from town hall and the police station.

(I apologize for the format; my copy is in columns and it did not transfer very well.)Move-Out Charge SheetCleaningClean refrigerator $25.00Clean stove top $10.00Clean oven $30.00Clean kitchen cabinets $30.00Clean kitchen floor $25.00Clean kitchen countertops $15.00Clean tub/shower surround $30.00Clean sink $15.00Clean toilet $20.00Clean bathroom cabinets & floor $20.00Window cleaning (per window) $10.00Vacuum/sweep through dwelling $40.00FlooringRepair carpet $85.00Replace linoleum $6/sq. ft.Replace floor tile $75.00 ea.Replace laminate flooring $10/sq. ft.WallsRemove/treat mildew (per surface) $15.00Repair hole in wall $55.00Repaint (per wall/ceiling) $40.00DoorsReplace door (interior) $165.00Replace door (exterior) $485.00Replace weather stripping $25.00ElectricalReplace light bulb $3.00Replace light fixture globe $20.00Replace light fixture $65.00Replace electrical outlet/switch $15.00Replace electrical cover plate $2.00PlumbingReplace kitchen faucet $150.00Replace bathroom faucet $105.00Replace faucet handle $20.00Replace faucet aerator $10.50Replace shower head $27.00Replace toilet $175.00Replace toilet seat $25.00LocksReplace key (door or mailbox) $10.00Replace cylindrical door lock $35.00Replace deadbolt lock $25.00Windows and Window CoveringsReplace window pane (single) $75.00Replace window pane (double) $125.00Replace mini blind $20.00Rescreen window screen $25.00Replace window screen and frame $50.00MiscellaneousReplace refrigerator shelf $25.00Replace stove/oven knob $20.00Replace plastic countertop $275.00Replace mirror $45.00Replace medicine cabinet $75.00Replace towel bar $25.00Replace shower curtain rod $25.00Replace shower curtain & rings $13.00Replace shower/tub enclosure $350.00Replace thermostat $80.00Replace fire extinguisher $30.00Remove junk and debris (per area) $35.00Replace smoke detector $15.00Replace combo detector/alarm $40.00Replace alarm battery (per battery) $2.00Replace drop ceiling tile $10.00Replace wireless doorbell $35.00Replace portable window screen $10.00Actual charges may vary based on condition and/or vendor bill.

Heat it is too expensive to separate so we include it and work on ways to decrease cost like insulation windows, and landlord thermostats. 

Anish Tolia ,While your right, they don't cost much, usually $40 to $80 depending on the size, but these costs were incurred BEFORE the property was placed into service, and the baseboard heaters and thermostats ended up around $450.So, according to the IRS, it must be added to the cost basis of the property, which is fine, but at what depreciation schedule?

Tip- install a spare thermostat sensor.  

I'm looking for a good landlord thermostat.

Have you checked to see if you can just replace the elements or the thermostat on the existing water heater?

The dryer needed a new thermostat Cost me 160$ all together.

if you have laundry on site make sure its coin op , or they are doing laundry on your dime and doing it often.16 year old boiler needs updating to a new high efficiency ones you'll save at least 20%controlled thermostats for each unit so they don't just set temps to a ridiculous tempsmaybe even high efficiency water heaters also (tankless)  worth looking intoenergy assessments from your utility company (they should have a free program-they do in my state)windows and doors . a broken window  can be costly as heat will never seem to turn off but this is summer season and the heat shouldn't be on i would think my neighbor's 6 unit (fully occupied) only costs him $300/month and he provides heat/hotwateroverall i found that i saved most money from insulation my highest gas bill was $425i changed my front door , bill dropped to $375replaced my windows , bill dropped to $325insulation in attic, basement, and knee walls, bill dropped to $275i think i gotten my gas bill as as low as $200 during winter which is pretty good for a single family in my neighborhood