Combining a furnace and water heater in a single AC closet is common in smaller homes and condos, especially across Florida and other warm climates. However, this setup requires careful planning around ventilation, safety codes, and door selection.
In this guide, we’ll explain the key considerations for dual-system closets, including building code compliance, airflow requirements, and the ideal AC closet door design to ensure long-term safety and performance.
AC closets that house both a furnace and water heater are space-saving solutions in residential construction. Builders often group mechanical systems into a shared utility space, making service access easier and lowering installation costs.
But placing two major appliances in one enclosure increases heat, airflow demands, and clearance requirements, which can quickly lead to code violations if not designed correctly.
Local jurisdictions—including Florida—enforce rules based on the International Residential Code (IRC) and National Fire Protection Association (NFPA) standards. Some important points include:
📌 Always consult a licensed HVAC professional and local building department to verify your configuration.
In nearly all cases: Yes.
A vented AC closet door is essential when both a furnace and water heater share the space—especially if:
✅ APA Closet Doors recommends louvered or slotted panel doors made of aluminum for enhanced airflow and heat tolerance. We offer customizable options that fit tight closets while maintaining a modern look.
Avoid wood or MDF. Instead, use aluminum or steel frames with glass, acrylic, or laminated inserts, which are more resistant to heat, moisture, and long-term warping.
Proper airflow prevents heat buildup and supports appliance longevity. Our vented panels allow for passive ventilation while keeping a clean, modern aesthetic.
Sliding or bifold doors are ideal in tight utility spaces. APA’s soft-close track systems offer quiet performance without sacrificing accessibility.
Beyond door choice, be mindful of the following in any dual-system AC closet:
A recent Miami-based multifamily project used APA Closet Doors’ aluminum bifold louvered system for a stacked water heater and heat pump enclosure. The client met both ventilation codes and space constraints, while maintaining a uniform interior finish throughout the unit.
Combining a furnace and water heater in one AC closet is doable—but it requires attention to ventilation, space, and safety. A properly chosen closet door system plays a vital role in making it compliant and efficient.