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Singe Stage: Will work at 0% of power or 100%;
Dual Stage: 0%, 50% or 100% of power;
Inverter: Increments of 1% of power as needed – no set speed.
At the end of the day, you have to ask yourself if you want to spend less money upfront and more money in the future with maintenance and electricity bills or if you want to spend more money upfront and less money along the way.
This is basically how it works; the higher SEER rating your equipment has the more energy efficient it is. The more energy efficient it is the more money it costs. Keeping in mind that here in the east coast we don’t get the exact SEER rating numbers listed on the equipment. Those standards were based on air conditioning units running at outdoor temperature of 82 degrees or less, while here we have much hotter outdoor temperatures all year around. The SEER value varies depending on the temperature and humidity of where the air conditioner is located. So when you buy a 16 SEER unit, you are not really getting a 16 SEER rating, but less. Until they change those standards, make sure to pick a high SEER rating unit.