We have been a long term customer (>5 years over 2 homes) on a monthly-paid service plan (2x/year service) that was sold as offering preventative maintenance yet in retrospect they always seemed to find something to upcharge for during their semi-annual visits. However the final straw for us was when we really needed service support and we were shocked at the immature response we received. Our AC unit in our new-to-us home stopped working (unit was 6 year old) the owner of Spark, Cleo, came out to diagnose the problem. He advised us that the unit was improperly installed and actually laughed at us in a “sucks to be you” manner when he advised that the unit wasn’t registered and therefore not under warranty. He made NO attempt to reach Carrier, the manufacturer, on our behalf as I would have expected from a company that believes in customer service. He verbally indicated that the repair might be ~$3,000 but wouldn’t give an actual quote. We then contacted another contractor who came out, contacted Carrier on our behalf and negotiated a 50% discount on an evaporator and a 10-year warranty. The final cost was 1/3 of what Spark alluded the repair bill might be. When I called Spark to cancel our service plan and shared my feedback of our experience they proceeded to charge us for an additional 2 months of service premiums (Nope! No apology, just a firm commitment to their cancellation clause). SHOCKING LACK OF INTEGRITY. In closing, I highly recommend you find another contractor before considering Spark Heating for any type of service (if they don’t disappoint you now they will eventually).