We had Gary's team led by Paul Swenson improve the insulation and reduce the air losses at our 20 year old home.  The team was very professional, did a great job, and left things cleaner than they found them.  My wife wants them to come back again.  The house feels more comfortable, and even during the last major cold spell when the temperature fell to below 10 degrees, the house felt comfortable and the heating had no problem keeping up.  Even the bonus room, which is known as a cold spot in most homes, is pleasant to use as my office.  I can't confirm energy savings yet, as it is too soon, but I am very confident that we will see a definite reduction in our costs.  This was money well spent, and I can highly recommend Energy Reduction Specialists.