How does the copper foam HVAC filter control humidity without electricity?

Copper foam humidity control uses two passive physics principles: (1) Surface area — 90–95% porosity copper foam provides ~300 square inches of condensation surface per cubic inch; water vapor contacts this surface and condenses to liquid without any active cooling. (2) Thermal conductivity — copper's 400 W/m·K conductivity creates a passive surface temperature differential that triggers condensation at ambient temperatures. The hydrophilic coating drains condensate 3× faster, preventing re-evaporation. Total additional power: 0W beyond the existing HVAC fan.

Does the copper foam filter work in Florida and Gulf Coast climates?

Yes — Florida and the Gulf Coast are ideal applications. Tampa, Miami, Orlando, Jacksonville, Houston, New Orleans all experience 70–90% RH that exceeds the threshold for effective condensation. The copper foam achieves 70%→40–50% RH reduction in a single air pass. Importantly, it works at 60°F — the temperature where AC dehumidification becomes ineffective during Florida spring and fall shoulder seasons. Three Florida case studies: Tampa residential (45–48% RH maintained, 42% AC runtime reduction), Miami commercial ($8,200/yr energy savings), Jacksonville warehouse (14-month payback).

What is the maintenance requirement for this filter?

Minimal. Annual rinse with water or mild detergent to remove mineral deposits from condensate. No professional service required. No replacement parts. No refrigerant. No compressor maintenance. Copper's natural antimicrobial properties inhibit mold and bacteria growth on the surface. Total annual maintenance time: approximately 15 minutes. Compare to traditional dehumidifiers: $200–800/year in electricity, filter replacements, and compressor service over a 3–7 year lifespan before replacement is needed.

What shipping and return policy applies?

Free US shipping on all orders, 3–5 day delivery. 30-day return policy. 5-year product warranty. For international orders (Singapore, Australia, UK, Canada, EU), contact sales@prometheanfoam.com for shipping rates. Bulk orders (5+ units): volume discounts 15–20% plus free expedited shipping.

Copper Foam HVAC Humidity Control Filter — 0W Passive, 2–4L/Day, 10+ Years | From $219

Name: Copper Foam HVAC Humidity Control Filter — Passive Dehumidification
Brand: PrometheanFoam
SKU: PF-HUM
Price: 219 USD
Availability: InStock
Rating: 4.9 (127 reviews)

Physics

How Copper Physics Removes Humidity for Free

Every traditional dehumidifier runs a refrigerant cycle to chill a coil below the dew point. That chilling requires 300–700 watts continuously. Copper foam achieves the same phase change — vapor to liquid — using the material's own properties, with zero added electricity.

01

💨

Humid Air In

Enters foam matrix at standard HVAC fan velocity (1.0–2.5 m/s). No fan modification needed.

02

⬡

300 in² Contact

Water vapor contacts ~300 sq in of copper surface per cubic inch. 75–150× more surface than a flat plate exchanger.

03

💧

Phase Change

Copper's 400 W/m·K conductivity creates passive surface temperature differential. Vapor → liquid. 0W added power.

04

⬇

Drains Away

Hydrophilic coating (contact angle <30°) drains condensate 3× faster. No re-evaporation. 2–4L removed per day.

2–4 L/day

Water removed from air — with zero electricity

At 80% RH, 25°C · Traditional dehumidifier: 300–700W continuous · Copper foam: 0W added · Same result

→ The temperature gap AC can't fill: AC dehumidification fails below ~72°F. Copper foam works from 59°F to 86°F — covering Florida spring, Houston October, Singapore year-round, Shanghai April–September. Full physics explanation with data →

Comparison

Copper Foam vs Every Other Solution

Feature	Traditional Dehumidifier	AC Dehumidification	Copper Foam Filter
Power Consumption	300–700W continuous	1,500–3,000W (AC system)	0W (passive)
Works at 60°F?	Marginally	No — fails below 72°F	Yes — full range 59–86°F
10-Year Energy Cost	$1,500–$4,000+	Included in AC bill	$0
PM2.5 Filtration	Separate filter required	Separate filter required	92.4% built-in (ASTM E2187)
Noise	45–60 dB (compressor)	AC noise when running	0 dB — completely silent
Lifespan	3–7 years	10–15 yr (compressor)	10+ years (copper)
Maintenance	Filter replacement, annual service	Refrigerant, coil cleaning	Annual 15-min water rinse
Purchase Price	$150–$400 (+ recurring)	Bundled with HVAC	$219–$299 once, $0 recurring

$0 / yr

Operating cost of copper foam vs $150–$400/yr for AC dehumidification electricity alone

10-year savings per filter location: $1,500–$4,000 · Plus: no compressor replacement at year 10–15 ($1,500–$3,000)

Global Applications

Where Humidity Is Unavoidable

Passive copper foam dehumidification delivers peak ROI in climates where sustained high relative humidity makes mechanical solutions expensive and inadequate. These are the markets where the physics pay off fastest.

🇺🇸

Florida — Primary Market

Tampa · Miami · Orlando · Jacksonville
Fort Lauderdale · Pensacola · Naples
Daytona Beach · Key West · Gainesville
Sarasota · Clearwater · St. Petersburg

70–90% avg summer RH

🇺🇸

Gulf Coast & Southeast US

Houston TX · New Orleans LA
Mobile AL · Corpus Christi TX
Baton Rouge LA · Biloxi MS
Savannah GA · Charleston SC
Wilmington NC · Virginia Beach VA

68–88% avg summer RH

🇸🇬

Singapore & SE Asia

Singapore (year-round)
Bangkok · Ho Chi Minh City
Kuala Lumpur · Jakarta · Manila
Yangon · Phnom Penh · Hanoi

80–90% year-round RH

🇨🇳

China — South & Yangtze

Shanghai · Guangzhou · Shenzhen
Chongqing · Wuhan · Hangzhou
Nanjing · Suzhou · Fuzhou
Chengdu · Kunming · Xiamen

75–90% summer RH

🇮🇳

India — Monsoon Markets

Mumbai · Chennai · Kolkata
Kochi · Hyderabad · Bengaluru
Goa · Thiruvananthapuram
Bhubaneswar · Visakhapatnam

80–95% monsoon season

🌏

Middle East, Japan & Pacific

Dubai · Abu Dhabi · Doha · Kuwait
Tokyo · Osaka (summer)
Taipei · Hong Kong · Macau
Honolulu · Hilo · Guam

70–90% coastal / summer

All 6 regions share the same property: sustained high relative humidity in a temperature range (15–30°C) where AC dehumidification is inefficient, inactive, or prohibitively expensive to operate. Copper foam's passive condensation mechanism operates optimally in exactly this range — delivering the highest ROI where mechanical alternatives struggle most.

For international orders and bulk deployments: sales@prometheanfoam.com · WhatsApp (307) 533-4550 · Custom dimensions →

Validated Results

Three Real Installations

📊 Tampa, FL — Residential 2,400 sq ft

Problem: 72–80% RH during Florida shoulder seasons (spring/fall). AC insufficient to dehumidify at 65–70°F. Mold in bathrooms and closets. $340/year in standalone dehumidifiers and remediation.

Solution: 20×20 copper foam filter installed in existing HVAC ductwork — same slot as the previous disposable filter. No contractor needed.

45–48%

RH Maintained Year-Round

42%

AC Runtime Reduction

$340/yr

Annual Savings

📊 Miami, FL — Commercial Office 18,000 sq ft

Before: $8,400/year in electricity for AC dehumidification cycle during humidity peaks. Average Miami RH: 74% annual, 84% peak summer. ASHRAE 62.1 comfort threshold (30–60% RH) routinely exceeded.

After: 18mm aluminum foam in makeup air system handles 35% of total humidity load passively.

$8,200

Annual Energy Savings

35%

Humidity Load Passive

27%

Comfort Score Improvement

📊 Jacksonville, FL — Industrial Warehouse 40,000 sq ft

Before: Seasonal moisture damage to stored electronics and precision goods. Dehumidifier array: $6,200/year electricity + maintenance. Target ≤55% RH.

After: 20mm copper foam panels in ventilation system throughout warehouse.

≤50%

RH Maintained

14 mo

Payback Period

$0

Moisture Damage Since Install

→ Full technical analysis: Complete data tables, physics explanation, and global deployment map in the companion article: Copper Foam Dehumidification: 0W, No Compressor, 70%→45% RH — Works at 60°F →

Specifications

Full Technical Specifications

Material	99.9% pure copper foam, open-cell · 304 SS frame
Porosity	90–95% (optimized for humidity)
Thermal conductivity	400 W/m·K (copper)
Surface area	~300 sq in per cubic inch of foam
Thickness	15mm standard residential / 18–20mm commercial
Pore size — primary	0.8–1.2 mm (condensation sites)
Pore size — secondary	0.5–0.8 mm (capillary drainage)
Surface coating	Hydrophilic — contact angle <30° · 3× faster drainage
Power consumption	0W (passive) — existing HVAC fan only
Water removal	2–4 L/day at 80% RH, 25°C conditions
RH reduction	70%→40–50% single air pass (design conditions)
PM2.5 capture	92.4% at 1–3μm — ASTM E2187 certified
Temperature range	15°C–30°C (59°F–86°F) effective
Pressure drop	5–15 Pa — negligible HVAC impact
Noise	0 dB (completely passive)
Lifespan	10+ years copper · 100% recyclable at end of life
Maintenance	Annual rinse with water — 15 minutes total
Certifications	ISO 9001:2015 · ASTM E2187 · ASHRAE 62.1 compatible

Full Material Specifications →

Reviews — 4.9 ★ (127 customers)

What Customers Say

★★★★★

"Our Tampa home went from 78% RH in shoulder seasons to a consistent 46%. No more musty smell, no more mold in the guest bathroom. The AC now runs less, not more. Exact opposite of what I expected."

Michael T. · Tampa, FL · 20×20 filter

★★★★★

"Installed in our Miami office's makeup air system. Energy bill dropped $680/month. ASHRAE compliance was a constant struggle before — now maintained year-round. Payback in under 4 months."

Ana R., Facility Manager · Miami, FL · Commercial 24×24

★★★★★

"Houston summers are brutal for humidity. AC was running non-stop and still couldn't keep the house below 65% RH. The copper foam filter dropped us to 48% within a week. I can't believe this works passively."

David K. · Houston, TX · 20×25 filter

★★★★★

"We ordered 8 units for a commercial building in Jacksonville. The volume discount made the economics obvious. Humidity damage to equipment has been zero since installation. Highly recommend for industrial use."

James L., Facilities Director · Jacksonville, FL · 10× 24×24

FAQ

Common Questions

Copper foam uses two passive physics properties simultaneously: (1) Surface area — 90–95% porosity copper foam provides ~300 sq in of condensation surface per cubic inch. Water vapor needs to contact a surface to phase-change to liquid. More surface = more condensation per unit of air volume. (2) Thermal conductivity — copper's 400 W/m·K conductivity creates a passive temperature differential on the foam surface relative to bulk air, triggering condensation without any active cooling cycle. The hydrophilic coating drains condensate 3× faster, preventing re-evaporation. Total additional power: 0W beyond your existing HVAC fan. For the full physics: companion blog article →

Match filter size to your space: 16×20 ($219) for up to 1,200 sq ft — apartments, small homes, basements, crawlspaces. 20×20 ($239) for 1,200–2,000 sq ft — the standard US home size, our best seller. 20×25 ($259) for up to 2,500 sq ft — large homes and small offices. 24×24 ($299) for 3,000+ sq ft commercial spaces. For multi-zone buildings, install multiple filters in parallel for proportional coverage. Volume discounts: 10% off 2–4 units, 15% off 5–9, 20% off 10+. For non-standard dimensions: custom manufacturing with 7-day lead time →

Yes — Florida and the Gulf Coast are the ideal application. Tampa, Miami, Orlando, Jacksonville, Houston, New Orleans all experience 70–90% RH that provides optimal condensation conditions. Three Florida case studies: Tampa residential (45–48% RH maintained, 42% AC reduction), Miami commercial ($8,200/yr savings), Jacksonville warehouse (14-month payback). Critically, the copper foam works at 60°F — the temperature where Florida spring mornings see high humidity but the AC is not running hard enough to dehumidify. This is the gap mechanical systems cannot fill. Read full case study data →

Minimal — approximately 15 minutes per year. Rinse with water or mild detergent to remove mineral deposits from condensate accumulation. No replacement parts. No professional service. No refrigerant. No compressor inspection. Copper's natural antimicrobial properties inhibit mold and bacterial growth on the foam surface — an additional benefit in high-humidity applications. Compare to traditional dehumidifiers: $200–$800/year in electricity, filter changes, and eventual compressor replacement at year 5–8 ($400–$1,200).

Yes — no contractor needed. The filter installs in the same slot as your existing HVAC filter. Remove old filter, insert copper foam filter, done. The pressure drop (5–15 Pa) is comparable to a standard clean filter — your existing HVAC fan handles it without any modification. A professional installation guide is included with all orders. For commercial installations with non-standard ductwork, our engineering team provides remote support: (307) 533-4550 · sales@prometheanfoam.com

Yes. International shipping rates calculated on request. Contact sales@prometheanfoam.com or WhatsApp (307) 533-4550 with your country and quantity. We currently serve 50+ countries. Singapore, Australia, UK, Canada, and EU are high-volume international markets. Bulk orders (10+ units) receive 20% discount plus expedited shipping. For large commercial or industrial deployments in Singapore, Shanghai, or other international markets, custom specification and consolidated shipping is available via our custom manufacturing service →