A lot of homeowners think that a furnace installation will be a really quick sort of service. They often think that a disconnect of the old furnace leaves this space a new furnace pops right into, and then you just have to connect the air ducts. Sorry to say, but the installation (and even the removal of the old furnace) is a bit more complicated than that. See for yourself.
Disconnecting and Reconnecting Electricity
Even if your furnace is not an electrical furnace, it still needs electricity. It uses that electricity to receive communications/signals from your thermostat and then ignites the gas or oil, or it turns on the switch that burns a built-in chemical to heat air and send it up through the ducts. Before you can install a new furnace, the old one has to be disconnected from its electrical sources, including your thermostat. The new furnace has to be connected to all of the old electrical connections that the old furnace had before you can ever turn on the new furnace.
Modifying Duct Work
New furnaces are shaped and sized very differently from the furnaces of ten or more years ago. That is why a lot of HVAC contractors include ductwork modifications in their estimates. They expect that they will have to add or detract a lot of the ducts that are already in your home. The old ducts fit with the old furnace, but you want to be sure that the new furnace will fit well with existing ducts and ductwork. Ergo, the contractor will have to make a few modifications to the ducts to make sure they fit the new furnace and that the new furnace is working with the ductwork that has been completed.
Securing the Furnace to the Floor
The furnace in many homes is located in the basement. In homes where there is no basement, only a slab foundation, there should be a utility closet where the furnace is located. Regardless of where the furnace sits or should be sitting, it still has to be secured to the floor. Heavy-duty drills address this problem by drilling big holes in the concrete and/or driving massive screws through the legs of the furnace or the base of the furnace into the concrete floor below. This keeps the furnace from shifting out of place and taking some of the ducts overhead with it.
Reach out to a furnace installation company to learn more.