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Age of the furnace, fuel type, and the rooms that stay cold.
New heating systems
A new furnace should match the house: duct size, chimney or PVC venting, and how cold a Newark January actually gets — not the largest cabinet that fits the closet.

What’s included
Process
Age of the furnace, fuel type, and the rooms that stay cold.
Closet, venting, and ducts — not just the data plate.
You see the recommended furnace and any duct notes.
Set, vent, start, and walk through operation.
Why it matters
Heat and cooling share ducts in most Newark homes. Installing a furnace in isolation from the air conditioner often creates a system that fights itself.
Pike Creek and Hockessin homes often have more zone complexity. Brookside and Ogletown ranches are simpler boxes with leakier trunks. The install should reflect that.

Often yes if both are near end of life. Not always. We will say so when a furnace-only job is the honest path.
Newark, Delaware
Call or request service with the ZIP and the symptom.