The average lead temperature is "warm" for direct mail and it takes about 40 leads to convert one into a deal, so it is not worth your time to do direct mail unless you can commit to at least 4,000 mailers per month.

Have water, fire, moisture, temperature, motion sensors, voice interaction with customers, throughout the systems.  

The upstairs (~1000 sq ft) is heated by 3 electric baseboard heaters and has been at a pleasant temperature at all times of day.The plan for the downstairs ADU (also ~1000 sq ft) was to do a combination of baseboard heaters and the existing system, however the existing system is not working and my contractor says was not installed properly.

I don't use toothpicks anymore, I use a 5/64" 6013 welding rod with the flux removed. 

How do you account for a cold front in February with temperatures below zero for 2 weeks? 

@Bin Chen I am not an HVAC professional, but in my experience every thermostat in my properties will heat the property to the set temperature.

The weather gets fairly cold in the winter and when the temperature drops to 5 degrees and a furnace goes on the blink expect to pay 200% more than the average cost for a repair, or pay for water damage caused by frozen water pipes.

I also do my own welding, plumbing, roofing and electrical work. 

@Tal Shachar also not sure if Menards is in your area or not but in addition to off the shelf Jen Weld windows which I've used many times https://www.menards.com/main/d...   

Start out at room temperature and turn up the heat slowly, he's not going to notice.The worst mistake I made as a novice landlord was to think "Oh my tenants are great", I don't want to scare them away with yearly increases.