Believe it or not, house plants can help improve the air quality in your home. Plants have a natural ability to purify our air. Their process of photosynthesis enables them to absorb light, and gasses such as carbon dioxide and use them to fuel their growth. As a bi-product they produce oxygen.
The North American Technician Excellence is the largest, non profit organization which tests and certifies HVAC technicians have the knowledge and skills required in this industry. This third party certification offers HVAC consumers confidence in knowing these certified technicians are properly trained and proficient with the equipment they service
Energy Star is a voluntary Energy Efficiency program by the US Environmental Protection Agency (EPA). It is now managed by the EPA and DOE (Department of Energy). It certifies various products which meet or exceed high energy efficient standards. These products are listed on their Energy Star Website. These rated products always carry the Energy Star Labeling, so look for Energy Star.