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Optimize the life of your unit with Omniguard® Total Corrosion Protection Technology.

Allied™ units now feature Omniguard® Total Corrosion Protection Technology, protecting against corrosive elements and extending the life of your unit for years to come.* When you consider an Allied unit, quality and value are a given. You’re getting peace of mind with great features and a smart design—and best of all, you get it right now.

Omniguard AC

Air Conditioners

4HP18V & 4AC16L

When the weather is at its hottest, Allied™ air conditioners and heat pumps are ready to provide economical cooling relief. Thoughtfully designed, these units feature Omniguard Total Corrosion Protection Technology, which offers enhanced corrosion protection for lower overall maintenance costs.

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Omniguard HP

Heat Pumps

4HP18V, 4HP16L, 4HP15L

Allied™ heat pumps can provide both heating and cooling, making them a smart choice for every season. Pairing a heat pump with a gas furnace creates a dual-fuel system that can maximize efficiency by alternating between two different fuels. Thoughtfully designed to improve heat transfer and operating efficiency, these heat pumps also contain Omniguard Total Corrosion Protection Technology, which helps to extend the life of the units.

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Omniguard Air Handler

Air Handlers


All Allied air handlers feature Omniguard Total Corrosion Protection Technology, which protects their evaporator coils against indoor corrosive elements. Combining this enhanced corrosion resistance with our Maximum Heat Transfer technology delivers more efficient and long-lasting operation. Whatever your needs, an Allied air handler is the right choice, right now.

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Omniguard coils

Omniguard Coils

Evaporator coils enhanced with Omniguard Total Corrosion Protection Technology offer improved corrosion resistance compared to traditional coils. Protected against indoor corrosive elements, such as aerosols, cleaners and other chemicals, Omniguard coils help safeguard against leaks for long-lasting performance and reduced maintenance costs over the lifetime of the unit.

*Omniguard Total Corrosion Protection Technology is available on select units.

Depictions of corrosion are based on accelerated exterior/interior coil corrosion degradation; actual coil corrosion time frame may vary. Household items like paints, furniture, etc. emanate gaseous substances known as volatile organic compounds (VOC). VOCs are responsible for the new home smell and, when combined with moisture, can create organic acids that cause corrosion. Results are based on comparisons of standard copper tube and aluminum fin coils to an aluminum tube and aluminum fin coil constructed of specific alloys and indicate less corrosion over time. It does not alleviate 100% of corrosive effectives.