For the applications where evaporative cooling belongs, we recommend rigid-media units with a properly sized bleed-off system, sized to the space rather than the footprint. The more important recommendation is usually about where to use one at all.
Rigid Media Over Aspen Pads
The pad type is the most consequential specification.
Rigid cellulose media — the honeycomb-style pads — cool more effectively, hold water more evenly, resist collapse, and last several seasons rather than one. They cost more upfront and require a blower with enough static capability to push through them.
Aspen fibre pads are cheap and need replacing every season. They also break down, and degraded pads leave dry channels where air passes through completely uncooled — a common cause of poor performance that gets blamed on sizing.
For anything you intend to keep, rigid media is the better purchase.
Bleed-Off Is Not Optional Here
Evaporative cooling concentrates minerals by design — water evaporates and dissolved solids stay behind. Hill Country water is hard, so that happens quickly.
A unit with a proper bleed-off or purge system continuously discharges a small amount of water to keep concentration in check. Without it, scale builds on pads, in distribution lines, and on the pump within a single season.
We set the bleed rate to your measured water hardness rather than a default. Homes with a water softener feeding the unit see dramatically less scale.
Configuration Matters
Down-discharge, side-discharge, ducted, or free-blowing — the right choice depends on the building.
In a long narrow shop, one large unit at one end leaves the far end warm regardless of total airflow. Two smaller units or a ducted configuration distributes better.
Roof-mounted units are common but create a roof penetration that has to be flashed properly and covered every winter. Ground or wall-mounted units avoid that.
Commercial and Agricultural Applications
For barns, equipment bays, and larger commercial spaces, industrial units with belt-driven blowers and heavier construction hold up considerably better than residential-grade equipment run hard.
These are also the applications where evaporative cooling makes the most sense, because air exchange is constant and the humidity added matters far less than it would in a sealed house.
Where We Recommend Against It
Being useful here means being honest about the limits.
Central Texas is marginal for evaporative cooling. In late spring, before Gulf moisture establishes itself, a good unit provides real relief. In July and August — the months you most need cooling — performance falls off sharply, and the added moisture makes indoor air feel clammy at any temperature.
It also requires open windows or a dedicated exhaust, which brings in dust and cedar pollen continuously. For a household with seasonal allergies that is a genuine drawback.
For conditioned living space through a full Hill Country summer, we recommend refrigerated air conditioning, which removes humidity rather than adding it.
The Alternative for Shops and Outbuildings
If the space is a shop, garage, or casita you want usable year-round, a ductless mini split is usually the better recommendation despite a higher purchase price.
It cools in August when an evaporative cooler cannot, it dehumidifies rather than humidifies, it heats in winter, and inverter-driven efficiency narrows the operating cost gap considerably.
For flushing heat out of a house on cool evenings, a whole house fan does what people often hope a swamp cooler will do, at almost no operating cost and with no added humidity.
Sizing and Installation
Whatever the application, we size by volume and required air changes, calculate the exhaust relief the unit needs, and test your water before setting the bleed rate.
Service is twice yearly — a spring startup and a fall winterisation, which matters here because a water-filled cooler left charged through a freeze will crack.
Contact 72 Degrees or call (830) 468-5316.
