Temperature is cooler in the summer than sw FL.Fort Myers / Naples is less expensive, more retirees, small town vibe, hot and humid in the summer.Both areas are great for vacation rentals.

What is the best way to throttle the max temperature a tenant is able to heat the apartment on my dime? 

Every since getting my degree, I've been in sales/ retail but have recently decided to enroll in school for welding.

Therefore, most underwriters take the loss to lease percentage of the gross potential rents number and apply that percentage to the pro forma projections or assume they can operate the property better by leasing units strategically by having leases expire in hotter (temperature and demand) months, thus applying a lower percentage of GPR loss to lease (typically 2% to 4%).

The minimum openable area to the outdoors shall be 4 percent of the floor area being ventilated.Heat Source- RequirementsR303.9 Required heating.When the winter design temperature in Table R301.2(1) is below 60°F (16°C), every dwelling unit shall be provided with heating facilities capable of maintaining a minimum room temperature of 68°F (20°C) at a point 3 feet (914 mm) above the floor and 2 feet (610 mm) from exterior walls in all habitable rooms at the design temperature.

These would be finding people who haven't listed their property but likely just need the easy button and a nudge from you to make their decision to sell.Moving outside the city to some surrounding counties can help as well.2 good targets for you to Consider: Absentee Owners with Equity and Seniors with 15+ year ownership.Here are some suggestions for your area counties,Absentee Owners: 13,256 Home value up to $300,000, single and multifamily, high equity Adams 1970   Douglas 122 Arapahoe 1162   Jefferson 1703 Boulder 863   Larimer 2643 Broomfield  49   Weld 2737 Denver 2007    Senior Homeowners: 9881 availableOwner Occupied, age 60-89, single family homes, High equity, home value up to $350,000, 15+ year Ownership AND Low Financial Stability Scores (FSS) Adams 2710   Douglas 38 Arapahoe 1211   Jefferson 771 Boulder 343   Larimer 523 Broomfield  29   Weld 1205 Denver 3051

However, it's super expensive for a 12 unit building and we have the sprinkler system which I believe would get set-off in the high temperature.  

Find a local metal shop (preferably one who specialized in wrought iron) and have them weld on the extra needed material, then have the railings powder sandblasted and powdercoated.

This would give her the ability to change the temperature while she is out of town.Then she could just text you if there is a package on the porch that needs to be put in the house.

welding?