Cold Blue Heating and Cooling

Good thing I had cold blue heating come out to service my unit. . Its only 1 1/2 years old. It needed to be cleaned , which I thought since it was a newly constructed house . But after he cleaned it he it would not come on. Being fall the air or heat was not on for a couple of weeks. He checked every thing. this is a high efficiency unit which draws air from the outside by a 4 in tube. He said it must not be getting enough air thats why its not comming on. Shure enough he found a wasp nest as big as the tube is round , about 6 foot in the tube from the outside. THANKS COLD BLUE !!!