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To winterize a swamp cooler, disconnect its power, shut off the water, drain the reservoir and supply line, clean and dry the unit according to its manual, then cover a fixed cooler or store a portable one in a dry sheltered place. The steps for pads, drains, and duct dampers vary by model and installation, so use your cooler’s owner’s manual for those details.
Before you start: identify the cooler and its shutoffs
Find the owner’s manual and confirm whether the unit is rooftop or ducted, window-mounted, or portable. Locate the water shutoff, drain or overflow, and any separate motor or pump disconnect. A rooftop cooler stays installed through winter; a portable cooler can generally be moved to sheltered storage if the manual permits.
Gather a sponge or soft cloth and, if the manual calls for one, a drain hose. Follow the manual’s restrictions on cleaning products and water exposure.
How to winterize a swamp cooler
- Disconnect the power. Turn off and disconnect electrical power before opening or servicing the cooler. The Frigiking manufacturer’s owner’s guide warns: “CAUTION: Disconnect all electrical power to the cooler before attempting to install, open, or service your cooler.” Follow the unit’s manual for any separate motor or pump disconnect.
- Shut off the water. Close the supply valve to the cooler. Confirm the line is no longer feeding water before draining.
- Drain the reservoir and water line. Use the drain method in the owner’s manual. For example, Frigiking’s guide directs owners to remove the overflow standpipe, drain and clean the reservoir, and soak up remaining water with a rag or sponge. Drain the supply line as well; for extended seasonal storage, that guide says to disconnect the line at both ends to help prevent freezing.
- Clean the unit as its manual allows. Remove debris and mineral scale using permitted methods. Cleaning restrictions are model-specific: the Frigiking guide, for example, says not to wash its cabinet with a garden hose and prohibits certain cooler cleaners, treatments, anodes, and other chemical additives. Do not assume another model has the same restrictions—or that a chemical product is suitable without checking its manual.
- Inspect the pads and frames. Look for damaged, clogged, or worn pads. Replace them only if their condition calls for it, and verify the make, model, part number, and dimensions before ordering. Some manuals give instructions for removing pads; do not treat pad removal as a universal winterizing step.
- Dry and protect the cooler. Let the reservoir and reusable media dry as directed. Cover a fixed unit with a suitable cooler cover or tarp. Move a portable cooler to a dry sheltered location where practical, and cover it if its manufacturer recommends doing so.
Fixed, rooftop, and ducted coolers
For an installed cooler, make sure the water supply is shut off, the reservoir and line are drained, and the unit is protected from weather. Consult the owner’s manual for any duct, damper, or indoor-opening instructions: there is no single damper procedure established for every cooler and installation. Municipal guidance from the City of Apache Junction also recommends shutting off the water, draining the pan, cleaning the exterior, and installing a cover.
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#1 Best Overall
Sale
Down Draft Swamp Cooler Cover for Evaporative Cooler 36"Wx36"Dx36"H, Black
- 【Compatible with Downdraft Coolers Measuring 36"W x 36"D x 36"H】Our swamp cooler cover is exclusively compatible with rooftop downdraft evaporative coolers, designed for units with dimensions of 36"W x 36"D x 36"H. Important Note: To ensure a perfect match and smooth installation, please verify your cooler's model and dimensions before purchase
- 【Wind-Resistant Design — Metal Buckles & Adjustable Straps】Two high-quality adjustable straps securely fasten the evaporative cooler cover to your unit. The galvanized alloy buckles are rust-resistant and exceptionally durable, while the high-density polyester webbing is tear-resistant, ensuring maximum protection even in severe weather conditions
- 【Superior Protection - Blocks Cold Air】This swamp cooler cover for outside units is constructed from heavy-duty Oxford fabric. This high-density material effectively blocks cold air from entering the interior space. Additionally, it provides excellent protection for your cooler against rain, debris, falling leaves, and UV damage, significantly extending the unit's service life
- 【All-Season Waterproof Protection】It effectively seals out moisture, whether it's the accumulated ice and snow of winter or the heavy downpours of summer. This ensures the core components of your cooler remain perfectly dry, giving you complete peace of mind and freeing you from the worries of wind and rain erosion
- 【Easy Installation】One side of the waterproof swamp cooler cover features a Velcro design, making it easy to put on and allowing for the passage of pipes or cables. The drawstring at the bottom can be tightened, so you don't have to worry about the cover being blown away by the wind
Portable coolers
After cleaning and fully drying the internal parts as the manual directs, disconnect the power cord and store the cooler in a dry sheltered location if possible. Portacool’s seasonal guidance recommends covering the unit with its protective cover or a tarp. Follow the specific model’s directions for pads and storage preparation.
When should you replace the pads?
Winterizing is a good time to inspect pads, but replacement depends on their condition and the cooler’s requirements. If pads are clogged, damaged, or worn, check the owner’s manual and confirm the correct replacement part or dimensions. Frigiking advises using the unit’s model and serial number when ordering its parts. Do not remove pads for storage unless the manual calls for it.
Quick Recap
Best Value
Sale
Swamp Cooler Cover for Evaporative Cooler, Down Draft, 34"W x 34"D x 36"H
- 【Designed for Down Draft Swamp Cooler】This swamp cooler cover is specially designed for Down Draft Swamp Cooler. There is Velcro that allows the cooler pipes and wires to pass through. Protects the cooler from rain, snow, and storms.
- 【Multiple Sizes To Choose From】Choose from a wide range of sizes to fit various models of Down Discharge Evaporative Coolers. Be sure to measure your Swamp Cooler first to determine the correct cover size.
- 【Prevent Air Convection】This down draft swamp cooler cover is crafted from heavy-duty polyester for stability and durability. It prevents warm air loss and cold air entry, making it a versatile choice for winterizing and outdoor protection.
- 【Windproof With Extra Two Straps】The swamp cooler covers for outside units with adjustable straps allows adjustment for a tight and custom fit. Extra Two military-spec metal buckles and abrasion-resistant reinforced webbing for strong fixation, even in gale weather, there is no fear that the evaporative cooler cover will slip or be blown off.
- 【Exceptional Waterproof Performance】Withstands up to 49,000 Pa water pressure (equivalent to 5m water depth), effectively resisting prolonged submersion, heavy rain, rainstorm, or high-pressure water exposure while maintaining internal dryness and structural integrity.
Rank #4
Winter Swamp Cooler Cover for Down Draft Evaporative Cooler,40"Wx40"Dx43"H
- Evaporative cooler cover size:40"W x 40"D x 43"H,Fit for Winter down draft evaporative swamp cooler up to this size,please confirm the size of your evaporative cooler before purchase.Please note:For easy to install,our cover is designed little larger than the cooler
- 100% weatherproof evaporative cooler cover:Our down draft evaporative swamp cooler cover is made of heavy duty waterproof 600D Oxford cloth,which is stury and durable,it can effectively protects your cooler from rain,snow,dirt and leaves,etc.keep the clooer clean and dry,extend the service life of your coolers
- Easy to fasten:The bottom of our down draft evaporative cooler cover has an elastic hem cord,and we also included 2 sturdy windproof straps.Adjustable hem cord with windproof straps provides the cover a customizable fit with exceptional security in the windy day
- Easy to use:Side of our draft evaporative cooler cover has designed with velcro opening,which allows the wiring and tubing go through and close to achieve sealed.And 2 strong padded handles can reduces the time and effort to install or remove the cover
- Best protector:This cover does more than just block moisture—it provides a protective thermal barrier that prevents cold air intrusion and minimizes heat loss.Ideal for winterizing your evaporative cooler, it safeguards internal components from freezing temperatures, ice damage, dust, and debris during long-term storage, extending your cooler's lifespan significantly
Rank #3
Winter Swamp Cooler Cover for Down Draft Evaporative Cooler,34"Wx34"Dx36"H
- Evaporative cooler cover size:34"W x 34"D x 36"H,Fit for Winter down draft evaporative swamp cooler up to this size,please confirm the size of your evaporative cooler before purchase.Please note:For easy to install,our cover is designed little larger than the cooler
- 100% weatherproof evaporative cooler cover:Our down draft evaporative swamp cooler cover is made of heavy duty waterproof 600D Oxford cloth,which is stury and durable,it can effectively protects your cooler from rain,snow,dirt and leaves,etc.keep the clooer clean and dry,extend the service life of your coolers
- Easy to fasten:The bottom of our down draft evaporative cooler cover has an elastic hem cord,and we also included 2 sturdy windproof straps.Adjustable hem cord with windproof straps provides the cover a customizable fit with exceptional security in the windy day
- Easy to use:Side of our draft evaporative cooler cover has designed with velcro opening,which allows the wiring and tubing go through and close to achieve sealed.And 2 strong padded handles can reduces the time and effort to install or remove the cover
- Best protector:This cover does more than just block moisture—it provides a protective thermal barrier that prevents cold air intrusion and minimizes heat loss.Ideal for winterizing your evaporative cooler, it safeguards internal components from freezing temperatures, ice damage, dust, and debris during long-term storage, extending your cooler's lifespan significantly
Rank #2
Sale
Down Draft Swamp Cooler Cover for Evaporative Cooler 34"Wx34"Dx36"H, Black
- 【Compatible with Downdraft Coolers Measuring 34"W x 34"D x 36"H】Our swamp cooler cover is exclusively compatible with rooftop downdraft evaporative coolers, designed for units with dimensions of 34"W x 34"D x 36"H. Important Note: To ensure a perfect match and smooth installation, please verify your cooler's model and dimensions before purchase
- 【Wind-Resistant Design — Metal Buckles & Adjustable Straps】Two high-quality adjustable straps securely fasten the evaporative cooler cover to your unit. The galvanized alloy buckles are rust-resistant and exceptionally durable, while the high-density polyester webbing is tear-resistant, ensuring maximum protection even in severe weather conditions
- 【Superior Protection - Blocks Cold Air】This swamp cooler cover for outside units is constructed from heavy-duty Oxford fabric. This high-density material effectively blocks cold air from entering the interior space. Additionally, it provides excellent protection for your cooler against rain, debris, falling leaves, and UV damage, significantly extending the unit's service life
- 【All-Season Waterproof Protection】It effectively seals out moisture, whether it's the accumulated ice and snow of winter or the heavy downpours of summer. This ensures the core components of your cooler remain perfectly dry, giving you complete peace of mind and freeing you from the worries of wind and rain erosion
- 【Easy Installation】One side of the waterproof swamp cooler cover features a Velcro design, making it easy to put on and allowing for the passage of pipes or cables. The drawstring at the bottom can be tightened, so you don't have to worry about the cover being blown away by the wind
Sources
- Frigiking Residential BW4002/5002 Owner’s Guide
- City of Apache Junction, Maintenance Booklet: Evaporative Coolers
- Portacool, Evaporative Cooler Seasonal Maintenance Guide
- The Home Depot, How to Use and Maintain an Evaporative Cooler
- Sylvane, How to Winterize Your Evaporative Cooler
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
