There are a few websites that will help you accomplish this. Qualitysmith.com is a website that lets you find local contractors and compare pricing for household utilities. Furnacecompare.com is another great resource. Boilerprices.weebly.com also has a lot of information to help your comparison.
Calling around to local contracting companies or a big utilities repair service for their professional recommendations might also help to point you in the right direction. Additionally, the Utica website has an extensive Frequently Asked Questions section as well as a customer service line devoted to helping you and answering any questions if you are still having trouble with your price comparison.