You may consider buying leads from places like HomeAdvisor, or people that do Facebook ads for you – but I strongly suggest OWNING YOUR MARKETING, and owning the methods to get leads for your company. Industry sources estimated that acquiring a single customer costs an HVAC contractor between $200 and $300. Often shared lead sites, will sell a lead to more than one company, thus the number might be cheaper (but that may be a sign of low quality, as well.)