Using proven strategies like opening windows to create cross-ventilation and installing ceiling fans, they manage to cool down their apartments enough to make it tolerable. Not using air-conditioning also saves money.
A comfortable interior temperature can be more easily achieved by ventilating and cooling the attic and the roof, as heat rises. Installing a solar roof fan is a relatively inexpensive one-time expense that will draw trapped air up and out of the building.
The benefits of this include a cooler attic so that less cooling in the living areas is required, plus fresh air circulating throughout otherwise stagnant areas reduces the chance of mold considerably.
Fans start at around $200 for the simplest Solar Panel (Solar Panel Attic Fan Model 4) and the most expensive commercially available model was on sale the day I searched at Amazon for $529.00 (Sunrise Solar Flat Base 1050 CFM Attic Fan).
Obviously the advantage of a bigger fan duct bank is that it will draw more hot air out of the attic faster than the less powerful versions, but they all work efficiently.
Installation of a solar fan is done on top of the roof and requires no additional wiring. The solar panel operates the fan by producing enough electricity to keep the fan blades spinning.
In a building in which utilities are paid by the residents, there isn’t a direct benefit for management. Tenant comfort does have a indirect affect on net operating income (NOI), however. Any successful effort to improve resident thermal comfort will have a corresponding beneficial effect on resident retention. Managers interested in these solar attic fans should also check with DSIRE and local utilities for possible rebates and/or tax incentives.