The Historic-Home Constraint Set
Pre-war Broward houses — old Dania, Hollywood Lakes, Sailboat Bend — were built to breathe, not to host duct trunks: no chases, plaster-and-lath walls that fight retrofits, sometimes preservation rules about exterior changes, and proportions that make modern registers look like vandalism. The cooling question is really a construction question: how much of the house are you willing to open, and what is allowed to show?
Path One: Ductless Mini-Splits
The least invasive answer: each zone gets a wall or floor head fed by a small line-set penetration; no ducts, no soffits, no plaster surgery. Inverter operation handles Florida humidity beautifully. The cost is visual — a head on the wall of a 1925 living room offends some owners and bothers others not at all. Floor-console units and careful placement soften it; the honesty is that you will see the equipment.
Path Two: Slim-Ducted Mini-Splits
The compromise most preservation-minded owners land on: compact ducted air handlers hide in closets, attics, or soffits and feed short duct runs to small, discreet registers. You get invisible equipment and conventional-feeling air distribution with far less construction than full ducting — but it needs somewhere to hide the cabinets and run the short ducts, which is a house-by-house puzzle worth walking with the installer.
Path Three: High-Velocity Small-Duct Systems
Purpose-built for retrofits: flexible two-inch ducts weave through closed walls and ceilings to small round outlets, fed by a compact high-pressure air handler. It reaches rooms the other paths cannot without opening walls, and its outlets are nearly invisible. The trades: specialized design and installation (fewer qualified installers), higher cost, and a faint air-rush sound at outlets that quality design minimizes. For the right house it is the only path that preserves everything.
Choosing Without Regret
Walk the house with the installer and ask three questions per path: what penetrations and construction does it require, what will I see when it is done, and what does each zone cost? Preservation-district homes should confirm exterior rules (condenser placement, line-set routing) before committing. And run the humidity conversation explicitly — historic houses leak air by design, so right-sized inverter equipment that runs long, gentle cycles beats oversized anything. Quotes that propose ripping in full-size ducts deserve a free second opinion before the plaster pays for it.
Three Ways To Cool A Historic House
Construction impact versus visibility versus cost.
| Factor | Ductless heads | Slim-ducted mini-split | High-velocity small-duct |
|---|---|---|---|
| Construction impact | Minimal — line-set penetrations | Moderate — hidden cabinets, short runs | Moderate — snaked 2-inch ducts |
| Visible equipment | Wall/floor heads in rooms | Small registers only | Small round outlets only |
| Humidity handling | Excellent (inverter) | Excellent (inverter) | Very good |
| Relative cost | Lowest per zone | Middle | Highest |
| Best for | Budget-conscious, equipment-tolerant | Most preservation-minded owners | Houses where nothing may show |
Before Cooling A Historic Home
- Walk every path with the installer — penetrations, visibility, zones.
- In a preservation district? Confirm exterior equipment rules first.
- Insist on right-sized inverter equipment — leaky old houses punish oversizing.
- Ask where condensate drains from every proposed unit location.
- Full-size duct retrofit proposed? Free second opinion before demolition.
Authoritative Sources
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Schedule ServiceFAQs
Can you put central AC in a house with no ducts?
Yes, three ways: ductless mini-splits, slim-ducted mini-splits hidden in closets and soffits, or high-velocity small-duct systems threaded through closed walls. Full conventional ducting is rarely the right answer in a historic house — the construction cost lands on the plaster.
What is a high-velocity AC system?
A retrofit-specific design: a compact air handler pushes air through flexible two-inch ducts that snake through existing walls to small, nearly invisible outlets. It preserves the house's look at a premium price with specialized installation.
Will mini-split heads ruin the look of my historic rooms?
That is a taste verdict only you can render — heads are visible by design. Floor consoles, careful placement, and slim-ducted alternatives (hidden cabinets, small registers) exist precisely for owners who answer yes.
Do preservation rules affect AC installation?
Local historic districts can regulate exterior changes — condenser placement, line-set routing on visible facades. Interior choices are usually yours. Confirm your district's rules before equipment is ordered, not after.
How do old leaky houses affect AC sizing?
They raise the true load and punish oversizing doubly: a too-big unit short-cycles while the house's natural leakage keeps importing humidity. Honest Manual J math with the envelope as it really is — plus long-cycling inverter equipment — is the comfort recipe.
What does it cost to add AC to a historic home?
It scales with zones and path: ductless per-zone pricing is the entry point, slim-ducted runs higher, high-velocity highest. The house's structure sets the real number — which is why we quote after walking it, never from the street.
