The only thing that you need to think about when buying advertising is "Will it be worthwhile?" People will take a loss in the offline world, online it is so simple to make money with ads that you should never stop trying.
PPC. Using PPC to promote your product is one way to make money. PPC such as Google AdWords is the best. It works like this: Google pays you for each visitor they send (between 10 and 50 cents). Many people have made thousands of dollars converting visitors to their website by getting cheap clicks.
It is really easy to get traffic with ppc for marketing and growing HVAC companies. These text links can be purchased from Digitalpoint. This is the key: make sure your link doesn't look paid for or sponsored. Google will penalize you if it does.
Image Source: Google
Guest blogging is a better option. A guest blogger is someone who writes a completely unique article and then posts it on their blog. Because you place your link at the end of each article, you get traffic and "link juice". The best thing is that you only pay for your time.
Advertise Your Affiliate Program. This is a great way to make use of paid ads as a product seller. This is a great example for leverage. You can attract the best affiliates and get tons of traffic. Clickbank Success Forum is a great place to advertise in this area. If you have a Clickbank product, this is a great place for advertising.