HVAC emergency in Chicago? Call Bernie's Heating & A/C Service now! Same-day service available for all heating and cooling emergencies.
HEPA filtration systems capture tiny airborne particles that standard filters miss, improving air quality for allergy sufferers.
True HEPA filters capture 99.97% of particles 0.3 microns or larger—but most residential furnaces can't handle them without a booster fan. We'll tell you if whole-home HEPA makes sense, or if portable units are a better fit.
HEPA stands for High Efficiency Particulate Air. Here's what that actually means for your home.
The Official Definition:
Captures 99.97% of particles 0.3 microns or larger
What 0.3 Microns Means:
1/200th the width of a human hair—microscopic particles invisible to the naked eye
MERV Rating Equivalent:
HEPA is essentially MERV 17-20 (MERV scale for residential only goes to 16)
What HEPA Does NOT Catch:
Not all "HEPA" filters are actually HEPA. Here's how to spot marketing nonsense:
Bottom line: If it doesn't say "True HEPA," it's not HEPA. It's like "military-grade" flashlights—meaningless marketing. Don't pay premium prices for fake HEPA filters.
Here's the technical challenge nobody talks about when selling you HEPA systems:
HEPA filters are DENSE. That's how they catch microscopic particles—by forcing air through tightly woven fibers. But density = resistance.
Residential furnaces aren't designed for this. Your standard furnace blower is built to push air through a MERV 8-11 filter. HEPA is like asking it to push through a brick wall.
Most residential furnaces can't handle true HEPA without a booster fan. Companies that install HEPA without addressing static pressure are setting you up for failed blower motors.
Separate cabinet with its own fan that pulls return air through HEPA, then returns cleaned air to supply ductwork.
Pros: Treats whole house, true HEPA performance, doesn't strain furnace blower
Cons: Expensive, requires space, filter replacement $150-200/year
Replaces standard filter rack, includes booster fan to overcome HEPA restriction.
Pros: Inline with system, less expensive than bypass
Cons: May still restrict airflow on older furnaces, professional sizing needed
Consumer units (Blueair, IQAir, Coway) placed in bedrooms/main living areas.
Pros: Cheap, no installation, proven effective, target specific rooms
Cons: Loud, need multiple units, manual filter changes
Best for: Budget-conscious homeowners who want HEPA where it matters most (bedrooms)
Honest answer: For most Chicago homes, 2-3 portable HEPA units ($600 total) work better than a $2,000 whole-home system. We install whole-home HEPA when you ask, but we'll tell you if portables make more sense.
Chicago has specific seasonal and year-round allergens that HEPA filtration can help with:
HEPA filtration isn't a one-time purchase. Here's the annual cost transparency:
10-year total cost example: $1,500 bypass system install + ($200/year Ă— 10 years) = $3,500 total. Factor this into your decision. A MERV 11 media filter runs $400 installed with $60/year replacement ($1,000 over 10 years).
HEPA is overkill for most homes. Here's when it makes sense—and when it doesn't:
Our recommendation: HEPA is overkill for most homes. A MERV 11-13 media filter ($400 installed) catches 80-90% of what HEPA does at 1/4 the cost and 1/3 the ongoing expense.
We'll install whole-home HEPA if you want it and your system can handle it. But we're not going to oversell you on something you don't need. That's not how we do business.
Proper HEPA installation requires measuring static pressure to ensure your system can handle it.
Measure static pressure to verify your furnace can handle HEPA restriction
Mount bypass cabinet or filter housing, wire booster fan to furnace controls
Verify static pressure stays under 0.5" W.C. (industry safe limit)
2-4 hours total installation time, includes cleanup and instruction
True HEPA filters capture 99.97% of particles 0.3 microns or larger. That includes pollen (10-100 microns), mold spores (3-40 microns), dust mite debris (5-20 microns), pet dander (5-10 microns), and bacteria (0.3-10 microns). HEPA does NOT filter gases, odors (VOCs), or viruses smaller than 0.3 microns—you'd need UV or PCO systems for those.
Whole-home bypass HEPA systems: $1,200-2,000 installed. Dedicated filter cabinets with booster fan: $800-1,500. Annual filter replacement adds $150-200/year. Over 10 years, a $1,500 system costs $3,500 total ($1,500 install + $2,000 in filters). Portable HEPA units ($200-800 each) are often more cost-effective for targeting bedrooms.
If you have diagnosed asthma or severe seasonal allergies triggered by airborne particles (pollen, mold, dander), HEPA filtration can help. But for mild allergies, a MERV 11-13 media filter ($400 installed) catches 80-90% of what HEPA does at 1/4 the cost. HEPA is overkill for most homes.
Whole-home HEPA filters need replacement annually at $150-200 per filter. Add pre-filters ($30-50/year) to extend HEPA life. Portable unit filters run $50-100/year per unit. Factor this ongoing cost into your decision—it's not a one-time purchase.
Most residential furnaces can't push air through true HEPA filters without a booster fan. HEPA filters are dense and restrict airflow significantly. We measure static pressure before installation to ensure your system can handle it. Bypass systems ($1,200-2,000) include their own fan. Installing HEPA without addressing static pressure can burn out your blower motor.
Honest answer: For most Chicago homes, 2-3 portable HEPA units ($600 total) work better than a $2,000 whole-home system. Portables let you target bedrooms where you spend 8 hours sleeping. Whole-home HEPA makes sense if you have severe allergies affecting multiple family members and need consistent filtration everywhere. We install whole-home systems when asked, but we'll tell you if portables make more sense for your situation.
We'll measure your system's static pressure, discuss your allergy concerns, and recommend the most cost-effective solution—whether that's whole-home HEPA, a media filter upgrade, or portable units.
No upselling. No "HEPA-type" scams. Just honest technical advice from techs who've been doing this since 2008.