PTAC units are becoming more energy efficient all the time, but they are still not as efficient as centralized units. However, sometimes the individual climate control you gain from having PTAC units in apartments, hotel rooms, classrooms, or offices are worth the trade-off. If you think you want to consider PTAC units for your home or business, the first thing to do would be to measure the rooms in which you would want to put the units. Once you know the square footage you need heating and cooling for, you can look up on a chart like the one below to determine the BTU rating you need in a PTAC system. Measure the room’s length and width, and multiply those numbers together to obtain the square footage. 100-150 sq. ft., 5000 BTUs 150-250 sq. ft., 6000 BTUs 250-300 sq. ft., 7000 BTUs 300-350 sq. ft., 8000 BTUs 350-400 sq. ft., 9000 BTUs 400-450 sq. ft., 10000 BTUs 450-550 sq. ft., 12000 BTUs 550-700 sq. ft., 14000 BTUs 700-1000 sq. ft., 18000 BTUs 1000-1400 sq. ft., 24000 BTUs You also have to consider whether your home or business has an open floor plan, or whether there are individual bedrooms or offices with exterior walls, since that is where PTAC systems are installed. PTAC systems work better in places where there are many smaller rooms with doors than in places with open floor plans or very large rooms. Climate is another factor influencing whether PTAC systems are right for your home or business. In general, PTAC units work best in climates where […]