If you are having your existing furnace or hot water heater repaired or replaced, consider having it relocated at the same time. It probably will be cheaper to combine projects than to do them separately. If you decide to raise your HVAC equipment, consider upgrading to a more energy-efficient unit at the same time.
Upgrading not only can save you money on your heating and cooling bills, but also may make you eligible for a rebate from your utility company. If you decide to protect your HVAC equipment with a floodwall, remember to leave enough space in the enclosed area for repairs and maintenance. If the wall has an opening to provide access to the enclosed area, the opening will need to have a gate that can be closed to prevent floodwaters from entering.