Does Tmark do furnace inspection, cleaning, and check ups for a small fee. The furnace works well but has occasionally gone off for no apparent reason?

Yes they cleaned and inspected my regular house furnace that heats the lower half of my home vacuumed oiled and inspected

A heads up to heating contractors. I bought a Triangle Tube hot water and boiler system for $2,500 four years ago this month. Last week a fan quit working which made the unit useless. $875.00 repair on a fairly new system is unacceptable. You will lose customers if an expensive system breaks down after a few years. The unit you replaced was probably 40 years old and worked fine, It was just inefficient. Check into it before you buy.