Since 2000, Mainstream Electric, Heating, Cooling & Plumbing has provided trusted duct sealing in Spokane to reduce allergens and improve indoor air quality for healthier homes.
Leaky ducts might be hidden behind your walls—but their effects show up in every room. From hot and cold spots to rising energy bills and dusty air, even small gaps in your ductwork can cause major inefficiencies. At Mainstream, our air duct sealing services are designed to stop air loss at the source—so your HVAC system works smarter, your home feels more balanced, and your indoor air stays cleaner.
Serving Spokane and Northern Idaho since 2000, we offer expert diagnostics, precision sealing, and follow-through you can count on. And because issues don’t always wait for business hours, we’re available 24-hours for emergency HVAC service. Want added peace of mind? Join our Care Club for priority service, seasonal system checkups, and exclusive savings that help you stay ahead of wear and tear.
Welcome to Mainstream Home Services – your one-stop solution for all your electrical, heating, cooling, and plumbing needs. Here’s why you should trust us with your home services:
We respect your time and prioritize efficient communication. We ensure minimal wait times for our technicians, allowing you to spend more time enjoying your home. Expect a call before our technician arrives, giving you the flexibility to plan your day accordingly.
No surprises, no hidden costs. Our upfront pricing provides competitive quotes tailored to your specific service requirements. You'll receive a detailed breakdown of the work involved, ensuring transparency and total peace of mind.
Our friendly, skilled technicians are experts in electrical, heating, cooling, and plumbing services. With state-of-the-art tools and expertise, we guarantee precise, code-compliant work. Your home will be left spotless, reflecting our commitment to cleanliness and professionalism.
We proudly service the following cities and neighborhoods in Spokane & Northern Idaho:
Not seeing your area? Give us a call at 509-237-6483
Explore our comprehensive indoor air quality services designed to address every aspect of your home’s atmosphere. Click the links below for more details on our specialized offerings:
Duct sealing helps reduce energy waste, improve HVAC performance, and enhance indoor air quality by preventing dust, allergens, and pollutants from entering your system. It also helps maintain consistent temperatures throughout your home.
If you notice uneven temperatures, high energy bills, excessive dust, or rooms that are hard to heat or cool, your ducts may be leaking. Mainstream’s team can inspect your system and confirm whether sealing is the right solution.
Mainstream technicians inspect your ductwork for leaks, then use professional-grade sealants or mastic to close gaps and weak points. Most projects are completed in a few hours, depending on your home’s size and duct layout.
Yes—sealing ducts keeps pollutants like dust, mold, and insulation fibers from getting pulled into your HVAC system, so the air your family breathes is cleaner and healthier.
Absolutely. Sealing leaky ducts prevents conditioned air from escaping, so your HVAC system doesn’t have to work as hard. That can lead to noticeable savings on your monthly energy bills.
We recommend a professional duct inspection every 3–5 years, or sooner if you’re noticing signs of poor airflow, increased dust, or rising utility costs. Mainstream offers thorough inspections and honest recommendations tailored to your home.
You might not see them, but leaky air ducts could be silently sabotaging your home’s comfort and efficiency. When conditioned air escapes through gaps, cracks, or poorly sealed connections in your ductwork, your HVAC system has to work overtime—and you end up paying for it in more ways than one. At Mainstream Electric, Heating, Cooling & Plumbing, we offer expert air duct sealing services throughout Spokane and Northern Idaho to keep your system running efficiently, your air clean, and your energy bills under control.
Our licensed HVAC professionals use proven techniques and high-performance sealants to locate and fix air leaks at their source. Whether you’re experiencing uneven temperatures, dusty air, or unexplained spikes in your utility costs, a professionally sealed duct system can make a big difference.
Duct sealing is the process of identifying and sealing gaps, joints, and holes in your home’s air duct system. These leaks often form over time due to vibration, settling, poor installation, or simple wear and tear. According to ENERGY STAR, up to 30% of the air that moves through the duct system in an average home can be lost due to leaks.
That means you could be spending a third more on heating and cooling than you should. Even worse, those leaks can draw in dirty air from crawlspaces, attics, or basements—polluting your indoor air with allergens, dust, and mold spores.
By professionally sealing your ductwork, Mainstream helps ensure that every bit of air your system works to heat or cool actually reaches your living spaces. That’s better for your budget, your HVAC system, and your family’s health.
Not sure if duct sealing is right for you? Here are a few telltale signs your system may be leaking air:
Uneven heating or cooling between rooms
Excessive dust buildup, especially near vents
Higher-than-normal energy bills
Weak airflow from certain registers
Hot or cold spots despite system running
Noisy HVAC operation or short cycling
If you’ve noticed one or more of these issues, it’s time to consider a duct inspection to assess whether sealing could improve performance.
At Mainstream, we believe in doing things right the first time. Our process starts with a thorough air duct inspection, including airflow testing and visual assessment, to identify trouble spots in your system. We then use advanced sealing methods and safe, long-lasting materials to close leaks without restricting airflow.
We don’t believe in shortcuts—just honest, expert service from the same team Spokane has trusted since 2000. Whether we’re sealing a single connection or optimizing your entire system, our goal is to leave your home more comfortable and more efficient than when we arrived.
Need fast support? We also offer 24/7 emergency HVAC services to keep you covered when unexpected problems arise.
Air duct sealing is a powerful way to boost HVAC performance, but it works best alongside other key services that support a clean, efficient home environment. That’s why Mainstream offers a full suite of complementary solutions:
Air Duct Cleaning: Before sealing ducts, it’s important to ensure they’re clean. Removing dust and debris improves airflow and indoor air quality.
Air Duct Inspections: Our inspections identify damage, air loss, and inefficiencies so we can target your biggest problem areas.
Humidity Control: Leaky ducts often cause excess humidity or dryness in the home. We install whole-home humidifiers and dehumidifiers to restore balance.
Whole House Air Purifiers: Sealing prevents outside air from contaminating your system—pair that with an air purifier to filter out allergens and pathogens.
Ventilation Services: In homes with tightly sealed ductwork, fresh air is still important. We offer solutions to ensure safe, consistent airflow throughout your home.
Every home is different, and we’ll work with you to build a plan that supports long-term efficiency and comfort for your household.
Want to prevent air leaks before they start? Our Home Maintenance Care Club includes seasonal checkups, priority scheduling, and exclusive discounts to help you stay ahead of common duct and HVAC problems. It’s the easiest way to protect your comfort—and your wallet—all year long.
At Mainstream, we treat your home like it’s our own—because we live here too. For over two decades, we’ve helped Spokane-area families stay safe, comfortable, and energy-efficient through trusted HVAC and indoor air quality services.
If you’re ready to stop air leaks in their tracks and enjoy a cleaner, more comfortable home, schedule your air duct sealing service with Mainstream today. We’ll make sure every breath of air your system delivers works exactly as it should.
Mainstream is Spokane’s #1 plumbing, electrical, heating, and air conditioning home repair specialists.
Call today to schedule your service!
