AC replacement in Gibbstown, NJ

Why it is two pieces of equipment

The outdoor unit and the indoor coil are rated together. A new outdoor unit on an old coil does not deliver the efficiency on its label, and the manufacturer's warranty may require the matched coil. So a quote for "a new AC" should name both model numbers.

Since January 1, 2025, new home air conditioners and heat pumps are built for R-454B or R-32 instead of R-410A. Those refrigerants run at different pressures and need equipment listed for them. In practice an old R-410A coil stays with the old outdoor unit. A system assembled entirely from components made before that date can still be installed, which is why some contractors still quote R-410A equipment.

Line set, pad and electrical

The copper lines between the two units may be reused if they are the right size, in good shape, and properly flushed. The contractor should say whether they are being reused and why. The outdoor unit sits on a pad, and the electrical disconnect beside it is often replaced at the same time.

Sizing

Cooling size is a heat-gain calculation, not a copy of the old unit. Sun on the west wall, attic insulation, window area and how many people live in the house all change the answer. An oversized unit cools the air quickly but leaves it damp, because it shuts off before it has removed much moisture. Gibbstown summers are humid enough that this is noticeable.

Doing it with the furnace

If the furnace is also old, replacing both together means one set of permits, one day or two of work, and a coil that fits the new furnace cabinet. If the furnace is newer, ask whether the new coil fits its cabinet without a transition piece.

About half of Gibbstown homes heat with utility gas and roughly three in ten with oil, according to Census estimates for ZIP 08027. A house with an oil boiler and no ducts is a different job: there, cooling usually means a ductless system, or a heat pump that also carries some of the heating.

Questions for the contractor

• What are the model numbers of the outdoor unit and the coil, and are they a matched pair?
• Which refrigerant does the new system use?
• Is the line set reused, and how is it cleaned and tested?
• What size, and what calculation is it based on?
• Who applies for the township permit?

What to say when you call

• The age of the current outdoor unit and the furnace
• Whether it still cools at all
• Gas or oil heat, ducts or no ducts
• Whether a quote is already in hand
• The address and ZIP code