If you can tie your shoes in the dark, you can mig weld.

Remind them this is not an airBNB vacation rental.As for the AC going out, are the temperatures where the house is that hot that right now they must have AC? 

Whatever you do, just don’t go with the mechanical deadbolt varieties in climates with high temperature variability.

I believe the temperatures were 85 to 90 during the time.This was just before Hurricane Ian.I didn't provide any written approval that they could stay in a hotel.

My current set up:(1) Furnace (in unfinished basement) with shared duct work to both units (1) Water heater in basement used for both units(2) separate electrical boxes for each unitHeat/ gas bill shared Separate Cooking oil/ stove bill for 2nd floorNo ACThe thermostat / temperature control is only in the 1st unit so all the 2nd floor can do is open/ close its duct work----Seems like I have three options that i can think of.

Once the temperatures warm up and the scenery becomes more picturesque, the real estate market also begins to heat up.

All it takes is the correct humidity, temperature and situation and mold will grow very quickly.

@Dru Kenny You are buying plastic and glass put together the brand does not matter as long as it is "welded" which every brand is nowadays.

The A/C temperature of the house during the summer season (April to October) is set to 76 to 74 degrees.

Unless you have a perfect door jam and minimal temperature fluctuations, most of the mechanical smart locks on the market today are a recipe for short battery life and lock jams that leave your property unsecured.