Equipment tier is the headline
Capacity and technology set the base: single-stage equipment costs less than variable-speed inverter systems, which repay the difference in comfort, efficiency, and humidity control over the years they run.
In our climate the humidity-control gap between tiers is felt daily, which is why we explain tiers in comfort terms rather than just numbers.
Ductwork is the hidden variable
A great system on leaky, undersized ducts performs like a mediocre one. Quotes differ most when one contractor prices the duct corrections a home needs and another ignores them.
Sealing, resizing runs, or adding returns adds scope — and is often the highest-value line on the estimate.
Code, electrical, and placement
Permits, condensate management, disconnects, and electrical corrections are not padding — they are the difference between an installation and a liability. Flood-zone homes may need elevated equipment platforms, and tight downtown lots can dictate compact side-discharge cabinets.
Coastal placements also deserve corrosion-conscious siting, which can influence equipment choice.
How to compare quotes honestly
Compare scope, not just totals: what ductwork is included, what code items, what warranty registration and commissioning. A cheaper quote that skips the load calculation is not cheaper for long.
Our pricing guide publishes the typical Charleston ranges we work within, and every estimate is free and in writing.
