To repair or update that is the question. When it comes to HVAC, you need to repair it a lot. If the HVAC is left dirty, worn plus rusted, it will just shut down. Then comes the question of paying for that immense HVAC repair or just getting all current HVAC entirely. Most HVAC dealers push for the current HVAC install. It gives them a higher commission rate. They hit you with the HVAC device, HVAC replacement plus their time plus labor. A immense bill for you plus a nice little bonus for them. Repairing the HVAC is a lot of work plus messing around for them. Also, there is no guarantee the hefty HVAC repair will work. It is a safer bet for the HVAC expert to push for a current unit. But, you can tell when the HVAC is able to be revived plus when it is not. For example, a furnace has a lot of parts that can go wrong. A fan can be disfigured, the motor belt is worn or the furnace filter is just dirty. These are low to moderate furnace repairs. The HVAC specialist can get it done in a day. Not a fun day for you, however the furnace is back to business. But, if the furnace has a broken heat exchanger, it is time for a current furnace. A current heat exchanger is basically the same cost as buying another furnace. Also, taking out the heat exchanger is sort of dangerous. It releases carbon monoxide into the home. In this case, don’t make the HVAC company do this.