UV Blue Lights vs. other options

Lennox has an incredibly good 3 part filter system, uv lights, catalyst and merv 16 filter:http://www.lennox.com/products/overview.asp?model=PCO

explained very well on their site. The kick start is a money making idea on his part, it is a hard start capacitor and when a compressor seizes or gets stiff that prolongs the life for a very short time. They can explode and are a poor idea.

What your contractor is referring to is the high side of air sanitizing. Trane has theirs as well as Lennox. The same folks that make the BlueTube also make their own version called "Purity" and it is about half the price of the name brands.

http://www.freshaireuv.com/purity/index.html

It really depends on what you are trying to accomplish. If your concern is washing the coil area to reduce mold build up and to keep the coil clean, then a Stick style light(s) is the answer. If you are wanting "in-duct" air purification, I would look at the Sanuvox R models, and if you want the whole shootin match, go for the "Staged" type units like the Purity.

Good Luck.

and by the way those hard starts are about 15 bucks at the supply house