Guides
Spray Foam vs. Blown-In Insulation: Which Is Right for Your Florida Home?
VR Insulation Team6 min read
If you have started comparing insulation for a Florida home, you have met the same two names everywhere: spray foam and blown-in. Both are excellent. They are also genuinely different tools, and the right choice depends on the space you are insulating, the state of what is in there now, and what you want the upgrade to achieve.
What Each One Is
Spray Foam
Spray polyurethane foam is applied as a liquid that expands and hardens in place. It does two jobs in one pass: it insulates, and it air seals. Closed cell foam sets rigid and adds a moisture barrier; open cell foam stays softer and costs less per inch. Because it expands into gaps, it reaches the cracks and seams that let conditioned air leak out of a building.
Blown-In Insulation
Blown-in insulation is loose fill, usually cellulose or fiberglass, blown into attics and wall cavities through a hose. Its strength is coverage: it settles around joists, wiring, pipes and odd corners that rigid batts leave exposed. Department of Energy studies put the heating and cooling savings of a properly blown attic at 15 to 25%.
How They Compare in a Florida Home
Air Sealing
This is spray foam's clearest win. Florida cooling loss is mostly air movement: conditioned air escaping, humid outdoor air pushing in. Blown-in slows heat transfer very well, but it does not stop airflow through gaps. If your home feels drafty or your ducts run through a vented attic, sealing matters as much as insulating.
Humidity
Closed cell spray foam resists moisture and adds structural stiffness, which is why it is the usual answer for crawl spaces and coastal exposure. Blown-in handles ordinary attic humidity fine, but it should never be installed over an active leak or damp decking, and it performs best with good attic ventilation.
Budget and Scope
Blown-in typically costs less for the same area and installs fast, which makes it the value pick for topping up a large attic. Spray foam costs more per square foot but does work nothing else can, especially in new construction, rim joists and unvented attic designs. Many Florida homes end up with both: foam where sealing is critical, blown-in for broad attic coverage.
Which Should You Choose?
- Large attic, working on a budget: blown-in gives the most coverage per dollar
- Drafts, high humidity or ducts in the attic: spray foam's air seal pays for itself
- New construction or a major renovation: spray foam locks the envelope from day one
- Older attic with thin, settled insulation: removal plus fresh blown-in is often the cleanest reset
The honest answer is that the right choice is specific to your house. Insulation that is perfect for a 2005 block home in Wesley Chapel can be the wrong call for a 1970s frame house near the coast. A short visit answers it definitively, and ours are free.