Does Spray Foam Insulation Help in the Summer Heat?

If you live in St. Petersburg, you already know that summer heat in Florida is no joke. Between sweltering temperatures, relentless sun, and sky-high humidity, staying cool indoors becomes a daily challenge. While cranking the air conditioning may seem like the only solution, there’s a smarter, more energy-efficient way to keep your home comfortable: spray foam insulation.

But does spray foam really make a difference in the summer heat?

At Koala Insulation of St. Petersburg, we help Florida homeowners beat the heat with insulation solutions tailored to our hot, humid climate. In this blog, we’ll explore how spray foam insulation works, why it’s effective during the summer months, and what makes it one of the best choices for year-round home comfort and energy savings.

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What Is Spray Foam Insulation?

Spray foam insulation is a high-performance material made by mixing two chemical components that expand upon application. It’s applied as a liquid that quickly fills cracks, gaps, and cavities, then hardens into a durable insulating layer.

There are two main types:

• Open-cell spray foam – Lighter, softer, and more affordable. Offers good insulation and excellent soundproofing.
• Closed-cell spray foam – Denser and more rigid. Provides a higher R-value, superior moisture resistance, and structural reinforcement.

At Koala Insulation of St. Petersburg, we offer both types and help homeowners choose the right one based on their specific needs, budget, and home layout.

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How Spray Foam Helps in the Summer

1. Blocks Heat Transfer

Florida summers bring intense sun exposure, especially on your roof and attic. Without proper insulation, this radiant heat seeps into your home, forcing your air conditioner to work harder.

Spray foam insulation creates an airtight thermal barrier that:

• Blocks outdoor heat from entering
• Keeps indoor air from escaping
• Maintains more consistent temperatures throughout your home

As a result, your AC doesn’t need to run as often or as long to keep your home cool.

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2. Reduces Air Leakage

One of spray foam’s biggest advantages is its ability to seal air leaks. Gaps around ductwork, electrical outlets, attic hatches, and crawl spaces allow hot air in and cool air out.

Spray foam expands to fill even the smallest cracks, helping to:

• Prevent unwanted airflow
• Eliminate drafts
• Keep humidity levels lower
• Increase energy efficiency

In a hot, humid environment like St. Petersburg, sealing your home is just as important as insulating it—and spray foam does both.

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3. Controls Moisture and Humidity

High humidity levels are a constant concern for Florida homeowners. Excess moisture can lead to mold growth, poor indoor air quality, and even structural damage.

Closed-cell spray foam acts as both an insulator and a vapor barrier, helping to:

• Keep humid air out
• Prevent moisture buildup in walls and attics
• Reduce condensation and mold risk

By controlling both heat and moisture, spray foam creates a healthier, more comfortable indoor environment.

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4. Improves HVAC Efficiency

Your HVAC system is one of the largest energy consumers in your home—especially in summer. Spray foam insulation reduces the strain on your system by helping your home stay cooler naturally.

Benefits include:

• Lower cooling costs
• Fewer maintenance issues
• Longer HVAC lifespan
• More balanced temperatures between rooms

Many of our customers at Koala Insulation of St. Petersburg report noticeable improvements in comfort and air conditioning performance after switching to spray foam.

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5. Insulates Hard-to-Reach Areas

Spray foam is ideal for insulating areas that traditional materials can’t easily reach, such as:

• Attic rafters and knee walls
• Crawl spaces
• Rim joists
• Behind electrical and plumbing systems

This flexibility allows for a complete insulation envelope, maximizing protection against heat and moisture infiltration.

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Where Should Spray Foam Be Installed?

In Florida homes, spray foam is most commonly used in:

• Attics and roof decks – Prevents heat from entering through the roof
• Crawl spaces and under floors – Protects from rising heat and moisture
• Exterior walls – Keeps cool air in and hot air out
• Garages and additions – Makes formerly unconditioned spaces livable

The experts at Koala Insulation of St. Petersburg will evaluate your home and recommend the areas that will benefit most from spray foam insulation.

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Is Spray Foam Worth the Investment?

While spray foam has a higher upfront cost than fiberglass or cellulose, it also delivers long-term energy savings, comfort, and durability that far outweigh the initial price.

Here’s what you can expect:

• Energy savings of 20–40% annually
• Improved indoor comfort during extreme heat
• Better humidity control
• Higher home resale value
• Reduced maintenance and repair costs

For Florida homeowners, especially during the summer, the return on investment is fast and substantial.

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Spray Foam vs. Other Insulation Types in Summer

Feature	Spray Foam	Fiberglass Batts	Blown-In Cellulose
Air sealing	Excellent	Poor	Fair
Moisture resistance	High (closed-cell)	Low	Moderate
R-value per inch	High	Moderate	Moderate
Mold resistance	Excellent	Low	Low to Moderate
Lifespan	20+ years	10–15 years	10–15 years

As you can see, spray foam outperforms traditional insulation materials, especially in Florida’s hot, humid summers.

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Conclusion: Stay Cool All Summer with Spray Foam

If you’re tired of high electric bills, hot bedrooms, and a constantly running air conditioner, it might be time to upgrade your insulation. Spray foam insulation is one of the most effective ways to keep your St. Petersburg home cool, efficient, and comfortable—even during the most intense summer heat waves.

At Koala Insulation of St. Petersburg, we specialize in spray foam insulation installation tailored to Florida’s unique climate. Whether you’re retrofitting an older home or insulating a new build, our team will guide you through the process and deliver results that last.

Call us today at (727) 416-6702 or visit https://koalainsulation.com/st-petersburg to schedule your free estimate.

Let’s insulate your home for a cooler tomorrow—starting today.