HVAC Services in Lemoyne, PA

No — two, and a bigger air conditioner solves neither. On a twin here we measured static pressure at 1.0 against equipment rated for 0.5, with no second-floor return. Adding an upstairs return and sealing the plenum and boots brought the upstairs within two degrees; a separate basement dehumidifier dealt with the smell. Same equipment, different system.

It is how hard the blower has to work to push air through your ducts, and most residential equipment is rated for about 0.5 inches of water column. In this borough's converted duct systems we routinely measure 0.9 to 1.2. At that level the blower cannot deliver rated airflow, which produces frozen coils in summer, limit trips in winter and rooms that never get air — regardless of how good the equipment is.

Generally yes. Shared party walls mean less exterior exposure and a smaller calculated load, so the correct replacement is often a size below what came out. Oversized equipment in a small shared-wall house short-cycles, dehumidifies poorly and carries noise through the party wall.

Yes — a number of these older borough houses run hydronic heat that is worth preserving. Zone valves, circulators, expansion tank charge, system pressure and radiator balance are all repairs, and a cold radiator is rarely a reason to replace a sound boiler.

Because the ductwork, not the equipment, is usually the limit in this stock. These houses were ducted to move warm air upward in winter, which convection assists, and the same system has to fight both resistance and gravity to deliver cold air to a top floor in July. If the static pressure is high, a larger or newer condenser cannot push more air through an undersized path. Adding return capacity and sealing the accessible runs addresses the actual constraint.

They overlap only while the cooling is running. Air conditioning removes moisture as a by-product of removing heat, so it dehumidifies only when the house needs cooling and only for as long as the compressor runs. In a river-side basement the damp is often worst in spring and autumn, when there is no cooling demand at all, and in summer an oversized system satisfies too quickly to condense much. A dedicated unit works on humidity directly, whatever the temperature is doing.