It does, but only as a side effect of cooling and only while it runs. It has no target humidity level to hold. A system that satisfies the thermostat quickly has not run long enough to remove much moisture, which is how a building ends up cool and damp at the same time. A dehumidifier gives you a moisture setpoint the way a thermostat gives you a temperature one.

Between 45 and 55 percent relative humidity suits most Florida properties. In that band the air feels comfortable, the potential for microbial growth drops, building materials and furnishings are protected, and the HVAC system works less hard. Below it you start drying out timber and finishes; above it, moisture problems begin accumulating.

A portable dehumidifier treats the room it stands in and needs its reservoir emptied regularly. A whole-home system integrates with your ductwork, treats moisture before air circulates through the building, and drains continuously to a planned condensate route. If the damp is confined to one small room a portable may suffice; if it is the building, it will not.

No — that is rather the point. Because the dehumidifier works independently of cooling, it removes moisture without lowering temperature. Many people find they can raise the thermostat a degree or two once humidity is under control, because air at 50 percent humidity feels cooler than damp air at the same temperature.

To a planned condensate drain, which is part of the installation design rather than an afterthought. A whole-home unit produces water continuously while operating, so the drainage route matters — a poorly planned one becomes the moisture problem you installed the equipment to solve. It is one of the things we work out before fitting anything.

It can help, though it is a new piece of equipment drawing power, so we would not promise a net saving. What it does is reduce the moisture load the air conditioner has been struggling against, which cuts cooling runtime and compressor workload. Whether that offsets the dehumidifier's own consumption depends on the property. The reliable gains are comfort and moisture protection.