Cool Crafters Heating and air provides superior service and repair on all brands of central heating and air conditioning products. Our service technicians have the ability to service and repair natural gas, propane, oil, electric, and heat pump systems in Columbia. Once we have completed the diagnosis, the technician will quote a flat rate for the needed repairs. Our flat rate charge is based on a regional average that takes into account how long the repair should take and what is a fair charge for the services rendered. We have found that our customers are much more comfortable with this than with an open-ended time and materials method used by many of our competitors.