We had used Spark Heating & Air Conditioning Ltd years back when they installed our furnace. Recently, when the system died in the middle of winter during a busy weekend, we had them come out again, this time to assess the situation. Their workers came across with high expertise, and even the owner showed up. They let us know what they were going to do, then went to work on tweaking it until they got the furnace working again. We've had other people show up throughout the years, door to door, trying to sell us their products. They seemed like scam artists just trying to convince us to purchase their systems. We don't get that from Spark. They've been really good with us, and they helped when we needed it the most.