1. Efficiency
Efficiency ratings are like gas mileage – the higher the rating, the more efficient the product is. All products are given the following ratings, so you’ll know exactly what to expect from your investment.

AFUE (Annual Fuel Utilization Efficiency)
This measurement gauges heating fuel usage. 80.0% AfUE is the minimum rating. Ratings of 90.0% are considered high- efficiency. 96.0% rated systems are also available. Higher AFUE systems cost substantially more.

HSPF (Heating Seasonal Performance Factor)
This measurement gauges the heating mode of heat pumps. Most new units have ratings from 7.0 to 9.4.

SEER (Seasonal Energy Efficiency Ratio)
This measurement gauges air conditioning cooling. All new models manufactured after February 2006 are required to have at least a 13.0 SEER rating.

2. Refrigerant
Freon Refrigerant R22
Since its debut in 1930, Freon refrigerant has been used in cooling systems. And while it’s still available, the Clean Air Act of 1990 prohibits the production of Freon–22-based air conditioners and heat pumps by 2010, and Freon–22 production by 2020. As Freon–22 production declines, its cost is predicted to rise. (Freon is a registered trademark of E.I. duPont de Nemours & Company.)
Puron® Refrigerant R410A
Puron refrigerant is chlorine-free, so it doesn’t damage the Earth’s ozone layer. And, as other refrigerants become less available, Puron refrigerant will be the refrigerant of choice for years to come.
3. Comfort
A properly sized and installed system will curtail temperature swings and provide for a continous flow of comfortable air for a more consistent indoor temperature.
Proper humidity in the heating mode will allow one to set their thermostat 1 to 3 degrees cooler and still feel comfortable while saving on energy requirements.
Air quality and ventilation should be designed to remove dust, allergens, pet dander, etc. by utilizing filters and fan speed.
4. Sound
Home comfort shouldn’t come at your ears’ expense.
Systems are available with ratings as low as 69 decibels (db), about the same as a refrigerator.