At G&J we offer Manual J and Manual D's in the Maryland, DC and Virginia area primarily and have over 14 years of experience in the residential HVAC Design industry. G&J has been doing work all around the DMV and even designing as far North as New York, and as far West as California. We specialize in the requirements of counties such as Fairfax, Arlington, and Prince William. We also offer permit expediting services so that you don't have to deal with the counties yourself. Our prices are $400 per system for the Manual J and Manual D duct design. If you only need the Manual J without the duct design it is $300 per system. Our designer has taken multiple training courses with Wrightsoft, and also completed ACCA training. If you would like assistance please contact us through the link, if you need to get on the phone with us just send over an email with your information and we will call you within 24 hours in most cases. Or you can find our number on gjhvacdesignllc.com. We look forward to working with you.