http://www.hotfrog.com/Companies/Air-Conditioning-Dallas/RSSUpdated every minute of every dayen-usCopyright: (C) Reed Business Information.http://www.hotfrog.com/Companies/Air-Conditioning-Dallas/Dallas-Energy-Efficient-Air-Conditioning-Upgrades-6482You can save money and protect the environment by upgrading the old builders grade air conditioning system. Yes, there will be a greater expense on the front end, but you need to think about the cost over a decade, not just today, when calculating your cost to cool and heat your home.yyyy-MM-dd