26 February 2026

The solutions against frost damage

Evaporative (or adiabatic) coolers are the ideal solution for those seeking efficient, environmentally friendly and economical thermal comfort during the warm months. Taking advantage of the natural process of water evaporation, they provide a cooler, healthier environment with minimal energy consumption and without the use of polluting refrigerant gases.

However, as winter approaches, these valuable machines, especially those installed outdoors or in unheated rooms such as sheds, become vulnerable to adverse weather conditions. Leaving a cooler exposed to the winter weather without adequate protection is a mistake that can cost dearly in terms of damage, repair costs and, most importantly, reduction in the useful life of the unit.

Why winter protection is crucial

The cold, humidity and weather typical of winter pose a serious threat to the structural and functional integrity of coolers.

  1. Ice and frost damage: residual water inside the tank and in the distribution circuit (even if draining is done) can freeze. Ice expansion can cause cracks or breaks in the piping, pump, evaporative panels (pads), and the tank itself, compromising the entire system.
  2. Corrosion and oxidation: prolonged exposure to rain, snow, and high humidity accelerates corrosion processes of metal parts and oxidation of electrical circuits.
  3. Accumulation of dirt and debris: winter wind carries dust, leaves, branches and other debris that can accumulate inside the unit, clogging filters and creating a fertile environment for the proliferation of mold and bacteria that will require more challenging sanitization upon spring reactivation.
  4. UV protection (even in winter): although less intense, winter UV rays can still contribute to deterioration and embrittlement of exposed plastics and seals.

The ideal solution: dedicated protective canopies.

The most effective and professional preventive measure is the use of protective canopies specifically designed for evaporative coolers. These are not just tarps, but technical covers made to insulate the unit by creating a complete barrier against the elements.

A proper winter cover not only protects the external envelope, but also prevents cold, moist air from entering through the unit, an especially important factor for stationary coolers that have an opening to the inside of the building.

Choosing the right material: strength and waterproofing for longevity

When choosing a protective canopy, the critical factor is not just the size, but the quality and technical properties of the material used. In order for the protection to be truly effective, the canopy must be made of materials with the following basic characteristics:

Water-repellent and water-resistant materials.

The primary function of a winter canopy is to prevent water (rain, melted snow or moisture) from penetrating and stagnating on the cooler.

  • Oxford fabric (coated or laminated): this is one of the most popular materials. Its strong weave is usually laminated with a PVC coating or polyurethane coating that imparts a high degree of waterproofing. It is resistant to tearing and abrasion, making it durable over time.
  • High-density polyester with PU/PVC coating: provides an excellent balance between light weight and strength. Polyurethane (PU) or polyvinyl chloride (PVC) coating ensures that water slides off, protecting the machine body and preventing surface icing.
  • Anti-UV fabrics (silver plating): many professional covers have special silver plating (or an anti-UV film) on the inner or outer surface. This not only protects against the sun's residual rays, but also helps reflect heat, preventing sudden temperature changes that could damage internal plastic components.

Air barrier and breathability

A good canopy must be air resistant (windproof) to prevent strong gusts from tearing the cover or moving the unit, but it is critical that it also be slightly breathable or allow minimal ventilation.

Important: Overly airtight protection can trap residual moisture inside the unit, leading to condensation and, in the worst cases, the growth of mold or rust. High-quality canopies are designed to be impervious to rain, but to allow internal condensation to gradually evaporate.

Additional features for total protection

  • Secure closures and fastenings: strong zippers, sturdy drawstrings, or snap fastening systems (clips/buckles) are essential to ensure that the canopy is not lifted or ripped off by strong winds.
  • Ease of application: should be custom-designed or standard sizes to fit most popular models, ensuring full, snug-fitting coverage.
  • Lightweight and easy to handle: despite strength, the material must be easy to fold and store when not in use, typically during hot weather.

Small investment, big savings

Protecting your evaporative cooler with a winter canopy made of durable, water-repellent materials is not an expense, but a smart investment that will safeguard its efficiency, prevent costly breakage due to freezing, and greatly simplify restarting in the spring.

Plan to secure your adiabatic system before the first frosts arrive!

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