THIS IS A COMPANY THAT DOES NOT STAND BY THEIR WORK! I BOUGHT A NEW HOME AND THE CENTRAL AIR A/C HAS NEVER WORKED CORRECTLY. IT BROKE NEARLY EVERY SUMMER FOR 7 YRS, INCLUDING THE FIRST SUMMER I LIVED IN MY BRAND NEW HOME. THE ULTIMATELY I PAID A HVAC COMPANY TO GIVE ME A PROPER DIAGNOSIS, TURNS OUT THERE IS NOT AN INLINE FILTER AT THE COMPRESSOR WHICH WAS INSTALLED BY DARBY JULY 29TH 2011 AND BROKE AUG 1ST 2012. AS THE ORIGINAL COMPRESSOR DIED COMPLETELY JULY 21ST 2011. AT THAT TIME I WAS TOLD BY DARBY THE NEW UNIT WOULD BE JUST FINE! DO NOT USE THEM. AFTER 6 YEARS OF A FAILING PRODUCT RELATED TO WHAT APPEARS TO BE A POOR INSTALL, AND SINCE THEY CANT GET IT RIGHT ON THE 7TH YEAR, IT IS NOW MY PROBLEM! NO WAY! DO NOT USE THEM!