Can my old cooler ducts carry refrigerated air?

Sometimes the main trunk can, after sealing and insulation. Cooler ducts are usually oversized for airflow and undersized for pressure, and they almost never include a return. Expect a duct evaluation before anyone promises reuse, and read our airflow testing page for what that involves.

Does a swamp cooler work during the monsoon?

Poorly. Evaporative cooling depends on dry air, and when Valley dew points climb in July and August the cooler adds moisture without removing much heat. That is why many homes pair a cooler with refrigerated air or convert outright.

What happens to the hole in my roof if I convert?

The cooler curb is removed, the decking is patched, and the repair is flashed and finished to match the existing roof. On foam roofs this is a roofing-trade task, so ask who performs and warrants it.

Is a rooftop package unit or a split system the better conversion?

A package unit reuses the roof position and needs no indoor air handler space, which suits many block-and-stucco tract homes. A split system needs a pad and an attic or closet air handler. Our rooftop unit guide compares them.

Could a mini-split replace my cooler instead?

For a small home or an addition, a ductless mini-split avoids the duct question entirely. It cools the rooms it serves and leaves the old cooler ducts abandoned or removed.

Should I keep the cooler as a backup after installing AC?

Only if you will actually run and maintain it. An idle cooler still needs winterizing, still sits over a roof opening, and still corrodes. Many owners are better served removing it.

Do rebates exist for converting from a cooler?

Utility and manufacturer incentives change by season and program. We will not quote amounts here; our rebates page lists what is current and how to qualify.

Can my old cooler ducts carry refrigerated air?

Sometimes the main trunk can, after sealing and insulation. Cooler ducts are usually oversized for airflow and undersized for pressure, and they almost never include a return. Expect a duct evaluation before anyone promises reuse, and read our airflow testing page for what that involves.

Does a swamp cooler work during the monsoon?

Poorly. Evaporative cooling depends on dry air, and when Valley dew points climb in July and August the cooler adds moisture without removing much heat. That is why many homes pair a cooler with refrigerated air or convert outright.

What happens to the hole in my roof if I convert?

The cooler curb is removed, the decking is patched, and the repair is flashed and finished to match the existing roof. On foam roofs this is a roofing-trade task, so ask who performs and warrants it.

Is a rooftop package unit or a split system the better conversion?

A package unit reuses the roof position and needs no indoor air handler space, which suits many block-and-stucco tract homes. A split system needs a pad and an attic or closet air handler. Our rooftop unit guide compares them.

Could a mini-split replace my cooler instead?

For a small home or an addition, a ductless mini-split avoids the duct question entirely. It cools the rooms it serves and leaves the old cooler ducts abandoned or removed.

Should I keep the cooler as a backup after installing AC?

Only if you will actually run and maintain it. An idle cooler still needs winterizing, still sits over a roof opening, and still corrodes. Many owners are better served removing it.

Do rebates exist for converting from a cooler?

Utility and manufacturer incentives change by season and program. We will not quote amounts here; our rebates page lists what is current and how to qualify.

Evaporative Cooler Replacement in Phoenix | Bleuwave HVAC

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?

A swamp cooler is a superb machine for April and a poor one for August. Here is how to decide whether to replace it in kind, convert to refrigerated air, or run both, and what each choice does to the roof, the ducts and the bill.

Replace in kind, convert, or keep both

Roof curbs and duct reuse explained

Honest about monsoon humidity limits

On-site sizing before any bid

Schedule today — we’re here 24/7.

Veteran Owned & Operated

The cooler on your roof was built for a different Phoenix

An evaporative cooler is an honest machine. A pump wets a pad, a blower pulls dry outside air through it, and the water that evaporates carries heat away with it. In April, with the humidity in the single digits, it can knock a serious number of degrees off the supply air on the electricity of a few light bulbs. Then July arrives. The dew point climbs, the monsoon parks over the Valley, and the same cooler pushes damp air into a house that is already sticky. It is not broken. It has run out of dry air to work with. Every replacement decision starts from that fact, and we lay out the mechanics in our evaporative cooler guide.

Three ways this goes

Replace in kind

A new cooler goes on the same stand, over the same duct, fed by the same water line. Rigid-media cabinets last longer than aspen pads and ask less of you each spring. This is the smallest scope and the right call for a small older home with no refrigerated-air ducts, an owner who accepts a few clammy weeks, and a budget that would rather not fund a second system.

Convert to refrigerated air

The cooler comes off, the roof opening is capped and flashed, and a central air conditioner or heat pump takes over. You gain a set temperature that holds through September, humidity control, and a house you can close against haboob dust. You also take on a larger electric draw during the hours APS and SRP time-of-use plans charge the most.

Keep both

Some Valley homes run the cooler in spring and fall and refrigerated air through the monsoon. It works, provided a proper damper keeps wet cooler air out of the AC ducts and conditioned air from blowing out through the cooler. It is also two systems to maintain, which is the part the brochure leaves out.

What changes the scope

The roof penetration. A down-discharge cooler sits over a large hole. Capping it means removing the curb, patching decking, flashing the repair and matching the roofing, which on a foam roof is its own trade. A side-discharge cooler through a wall or window is far simpler to retire.
Duct reuse. Cooler ducts are big, low-pressure, often uninsulated and built without a return. Refrigerated air needs a sealed supply, insulated attic runs and a real return path. Sometimes the trunk survives. Often the branches and the return air do not.
Electrical. A cooler runs on an ordinary household circuit. A condenser needs its own circuit, a disconnect and panel capacity to spare. That is a licensed electrical task, never a homeowner one.
Where the new equipment lives. A rooftop package unit can reuse the roof position. A split system needs a pad outside and a place for the air handler, usually a closet or a 155-degree attic.
Sizing. Coolers were never sized with the same math as air conditioners. A load calculation on the actual house, with its west-facing glass and its insulation as found, decides tonnage. A web page cannot.

Energy and water, without the pitch

The cooler wins on electricity by a wide margin and loses on water and on humid days. Refrigerated air wins on comfort, on dust, and on predictability, and costs more to run in the afternoon peak. Neither side needs exaggeration. If you are on a fixed budget in a small home, you tolerate the monsoon, and your ducts were never meant for an air conditioner, a new cooler is a defensible choice. Do not let anyone call the swamp cooler obsolete. Call it seasonal.

When not to spend the money

Pads, pumps, float valves, belts and blower motors are inexpensive wear parts. A cooler with a sound cabinet and a rotted pad needs pads. A cabinet rusted through, a warped stand, or a unit leaking onto the roof deck has finished its career. If refrigerated air already exists and the cooler is a backup nobody runs, the cheapest fix may be removing it and capping the roof before it leaks. Our repair-or-replace guide walks through the same logic for any piece of equipment, and a maintenance plan keeps whatever you keep running.

Questions to ask any bidder

Will you perform a load calculation on my house, or size from the old cooler's rating?
How will the roof opening be closed, and who warrants the roofing work?
Which of my existing ducts will you keep, and how will you test them for leakage?
Where does the return air come from in your design?
Does my electrical panel have the capacity, and is that inspected before the bid is final?
If I keep the cooler too, how do you isolate the two systems?
Is the price flat-rate and fixed before work begins?

The visit that settles it

We can talk trade-offs on the phone all afternoon. What we cannot do from a desk is measure your ducts, check your panel or see how the cooler curb meets the roof. An on-site evaluation does that in an hour, and it ends with written options rather than a guess. Financing on approved credit is available, and our estimates and financing page explains how a quote is built. If your cooler is the only cooling you have and it has quit in July, same-day service comes first and the replacement conversation comes after.

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?

Replace in kind, convert, or keep both

Roof curbs and duct reuse explained

Honest about monsoon humidity limits

On-site sizing before any bid

Schedule today — we’re here 24/7.

Veteran Owned & Operated

What changes the scope

The roof penetration. A down-discharge cooler sits over a large hole. Capping it means removing the curb, patching decking, flashing the repair and matching the roofing, which on a foam roof is its own trade. A side-discharge cooler through a wall or window is far simpler to retire.

Duct reuse. Cooler ducts are big, low-pressure, often uninsulated and built without a return. Refrigerated air needs a sealed supply, insulated attic runs and a real return path. Sometimes the trunk survives. Often the branches and the return air do not.

Electrical. A cooler runs on an ordinary household circuit. A condenser needs its own circuit, a disconnect and panel capacity to spare. That is a licensed electrical task, never a homeowner one.

Where the new equipment lives. A rooftop package unit can reuse the roof position. A split system needs a pad outside and a place for the air handler, usually a closet or a 155-degree attic.

Sizing. Coolers were never sized with the same math as air conditioners. A load calculation on the actual house, with its west-facing glass and its insulation as found, decides tonnage. A web page cannot.

Questions to ask any bidder

Will you perform a load calculation on my house, or size from the old cooler's rating?

How will the roof opening be closed, and who warrants the roofing work?

Which of my existing ducts will you keep, and how will you test them for leakage?

Where does the return air come from in your design?

Does my electrical panel have the capacity, and is that inspected before the bid is final?

If I keep the cooler too, how do you isolate the two systems?

Is the price flat-rate and fixed before work begins?

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About Bleuwave

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?

The cooler on your roof was built for a different Phoenix

Three ways this goes

Replace in kind

Convert to refrigerated air

Keep both

What changes the scope

Energy and water, without the pitch

When not to spend the money

Questions to ask any bidder

The visit that settles it

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?: common questions

Keep reading

Evaporative Cooler Replacement throughout the Phoenix area

Let us look at the roof before you decide

Request service

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?

The cooler on your roof was built for a different Phoenix

Three ways this goes

Replace in kind

Convert to refrigerated air

Keep both

What changes the scope

Energy and water, without the pitch

When not to spend the money

Questions to ask any bidder

The visit that settles it

Evaporative Cooler Replacement: New Cooler, or Refrigerated Air?: common questions

Keep reading

Evaporative Cooler Replacement throughout the Phoenix area

Let us look at the roof before you decide

Request service