Lennox Life
tips & maintenance

How to take care of your HVAC system when a hurricane hits

Thank you for your interest in how to protect your home and HVAC system during a hurricane. View an updated version of this post here.

We all know the precautions we should take to protect our homes and families when a hurricane threatens: stock up on water and non-perishable food, get out the flashlights and weather radio, buy lots of batteries, bring in your lawn furniture and board up the windows.

But did you know that you could also take precautions to protect your HVAC system? Knowing how to protect your HVAC system before the storm and how to approach it afterwards not only helps to minimize system damage, it can also help to keep you safe.

HVAC preparation before the hurricane

To keep your HVAC equipment as safe as possible during the storm it's recommended that you: 

  1. Turn off the breakers to your A/C or heat pump and indoor air handler or gas furnace 
  2. Turn off the gas supply to gas furnaces 
  3. Secure your outdoor unit. Make sure all bolts are secure and tight, and use hurricane straps when possible
  4. Protect outdoor equipment from flying debris 
  5. If floodwater is a concern, have your HVAC unit placed on an elevated platform
  6. DO NOT turn your HVAC system on right after the hurricane has passed; have it inspected by your Lennox Dealer first, before you turn it back on. While your HVAC system is turned off, there are plenty of other things you can do to keep cool and comfortable.

HVAC safety after the hurricane

If your HVAC system was exposed to flooding or experienced other types of damage during the storm, some of that equipment may need to be replaced. Some can be repaired, but your system will definitely need to be inspected by an expert. The Air-Conditioning, Heating and Refrigeration Institute (AHRI) recommends that you follow these important safety precautions once the storm has passed.

Gas and oil furnaces and boilers

If there is any question that floodwater has reached your gas or oil furnace or boiler, it should be checked by a qualified contractor. This equipment has valves and controls that are especially vulnerable to water damage from floods—damage that might not be immediately visible. Corrosion begins inside the valves and controls, and damage may not be apparent, even if the outside of the device is clean and dry. At a minimum, this damage can result in reliability problems.

Electric furnaces

An electric furnace consists of electrically heated coils, a fan to provide air circulation across the coils, and controls that include safety relays. As with a gas furnace, an electric furnace is susceptible to corrosion and damage from floodwater, creating potential reliability problems or safety hazards. If there is any question that floodwater has reached your electric furnace, you should have it checked by a qualified contractor.

Propane heating

Use extreme caution if there is the potential for propane leaks. Have propane equipment checked, repaired and/or replaced by a contractor as quickly as possible after a flood. In every case, contractors must replace all valves and controls that have been in contact with floodwater. The gas pressure regulator on a propane system should also be checked. This regulator contains a small vent hole to sense outside pressure. For effective gas pressure regulation, this hole must always remain unobstructed. During a flood, debris can easily plug the hole, causing a dangerous malfunction or corrosion.

Radiant floor heat

With this type of heating system, electrically-heated cables or tubing circulating a fluid are embedded underneath or within the flooring material. The cables warm the floor, which in turn warms the room by radiant heat. If the floor becomes wet from a flood, it can weaken and perhaps crack and may need replacement. Both electrical cables and tubing can be damaged due to a wet floor. Therefore, you should consult a qualified professional to determine whether the system can continue to be used.

Heat pumps and air-conditioning systems

Split air conditioning and heat pump systems have power and control wiring between the indoor and outdoor parts of the system, and piping that allows refrigerant to flow through the system. If floodwater has repositioned either the indoor or outdoor units of a split system even by a small amount, there is a potential for refrigerant leaks. The system will then require a major repair or full replacement. If the refrigerant system remains intact after the flood, the entire system should be cleaned, dried and disinfected. You should also have the contractor check the indoor and outdoor units' electrical and refrigeration connections, including all control circuits. The decision to repair or replace should be made after consultation with a qualified professional on a case-by-case basis.


If your house contains a central forced-air system, attention should also be paid to the ductwork. A contractor will not try to salvage duct insulation that has been in contact with floodwater, but will replace it because it is impossible to decontaminate. The contractor will also clean, dry, and disinfect the ductwork itself. A thorough job will require disassembling the ductwork, reassembling it, and then re-sealing the joints for improved insulation and to reduce heat and cooling loss.

Water heating systems

Whether a water heater uses gas, oil or electricity, if it was exposed to floodwater, the unit should be replaced. A new water heater is a relatively small investment, and replacing it is fairly easy to do. If the water heater was more than five years old, the chances are good that a new unit will be more efficient, which will save you money in the long run.

In gas and oil units, valves and controls can corrode. In an electric unit, the thermostat and controls can corrode. In all types, the insulation surrounding the unit will likely be contaminated and will be nearly impossible to disinfect. In addition, the insulation takes a great deal of time to dry and can lead to corrosion of the tank from the outside.

Even if water heater components have been cleaned and the unit seems to operate properly, parts may corrode in the future. Both gas and electric water heaters have a pressure relief valve that can corrode and stick after being exposed to flood water. You should be sure, therefore, to replace this valve as well. 

Warranty service

All air conditioning manufacturers offer warranties on their equipment in varying amounts. Unfortunately, warranties do not cover equipment damaged by floods and catastrophic events. Insurance, on the other hand, covers damage from accidents or unpredictable circumstances such as hurricanes and floods.

In the case of hurricane damage to your HVAC system, you should work with your home insurance provider to file a claim.

Use qualified contractors for your HVAC repairs and replacement

AHRI recommends that all inspection and replacement work on flooded equipment be performed by a qualified heating and cooling technician, like a Lennox Premier Dealer, not by homeowners. Qualified contractors are listed by zip code in the North American Technician Excellence (NATE) Contractor Locator at www.natex.org. Federal tax incentives for replacements and upgrades are available.

If your HVAC system is affected by storms as the hurricane season progresses, please contact your local Lennox Dealer to verify your equipment's safety and/or to replace it.

More Comfort Matters

alt text goes here

It's also easy to find an expert Lennox® dealer who can help
you make the most of your HVAC system.

View Now