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But cost isn't the only issue to consider. A contractor needs to make sure he finds a unit that will fit into his business and work with the services he plans to offer. Where a contractor does business - driveways, parking lots, roads, etc. - will also influence the unit he chooses to purchase.

It is important that contractors consider the planned use for the infrared equipment before they decide what size and configuration to purchase, Marshall says. Contractors not only need to consider the type and size of job the equipment will be doing, but also how often the equipment will be used.

"The more I keep my assets working, and working profitably, then the more money I make," Burke says. Larger units will be more of an investment but worth it if a contractor plans to use it often. If the unit will only be used as a part-time service, a smaller unit might be a better purchase.

However, Van Velsor says that some contractors will make the mistake of buying too small of a pavement heater. "You need equipment that is large enough to allow you to accomplish a dollar amount to make it all worth while," he says.

Infrared units in today's market have a wide range of sizes and configurations. They can range from covering 4-square-feet to 64-square feet, Marshall says. And they are available as walk-behind, truck-mounted, and trailer-mounted units. All units can be used for the same applications, but some may be a better choice than others depending on jobsite conditions.