5 things to look out for when buying an air purifier for the first time
Pay attention to these so you don't waste your money and time
5 things to look out for when buying an air purifier for the first time
Pay attention to these so you don't waste your money and time
"Love the item, I can definitely feel the air quality difference in my room! Even my kids are sleeping better with the Moon. Thank you for such an awesome product. I highly recommend!"
- Brittney, USA
Verified
"Have been using Sterra for weeks and it has tremendously helped with my sinus and sneezing because I'm very allergic to dust and pet smells. It's light-weight and I can easily move to other rooms."
- Mariah, USA
Verified
"Used to have bad sinus issue on waking up. Since using the Sterra Moon, my sinus condition has greatly improved. It also takes a few minutes to clear up any unpleasant smells."
- Vickie, USA
Verified
Introduction
Introduction
Hey clean air lovers! We're STERRA - a wellness tech brand committed to improving your home quality of life through premium, well-designed, and affordable products.
We believe that everyone deserves to breathe cleaner, fresher air at home without breaking the bank. That's why we created affordable air purifiers that deliver top-tier performance and sleek designs—all without the inflated price of big-name brands.
Our latest model is the Sterra Moon – which we designed to be the most compact and powerful air purifier at the best value on the market in 2025.
We equipped it with everything you need in an air purifier, including these five things you should look out for when you're buying one for the first time, and even unlocking our exclusive offer to help you get the best deal.
Price
This is one of the biggest factors to consider when buying an air purifier.
Most air purifiers on the market come with hefty price tags due to brand markups and unnecessary features. A decent, well-known air purifier can easily cost over $500, while so-called "premium" models can easily go beyond $1,000.
Most decent air purifiers on the market range from $500+ to $1,000+
Contrary to popular belief, a higher price doesn’t always mean better quality and performance. Many high-end air purifiers add flashy features like proprietary technologies, multi-functional heating or cooling, or separate remote control—none of which significantly improve air quality but can skyrocket the price.
On the flip side, going too cheap can also be a mistake. Many budget air purifiers under $100 cut corners by using cheap materials, weak filters, and outdated technology, leading to poor performance, loud operation and frequent breakdowns.
The Sterra Moon delivers powerful air purification at a fraction of the cost. It packs industry-leading features that rival top-of-the-line models in a sleek and ultra-compact design for a market-beating $299 price.
This highly effective air purifier costs 40-78% less while sporting useful cutting-edge features that rival other top-of-the-line brands. Plus, our exclusive offer gives you an extra $298 in value!
Coverage area
Next we'll look at coverage area.
Depending on your room size, you’ll need an air purifier that can effectively cover a small, medium, or large space. In general, smaller purifiers are best for compact rooms, while larger models are designed to handle medium to spacious areas.
Many high-end air purifiers have surprisingly low coverage areas despite their high price tags. On the flip side, cheap air purifiers often struggle to clean even small rooms properly. Price doesn't always reflect performance—what really matters is how much space the purifier can effectively cover.
The Sterra Moon is designed to be sleek and ultra-compact while covering up to 615 sq. ft.—making it perfect for bedrooms, living rooms, home offices, and even studio apartments. Whether you need fresh air in a cozy space or a larger open area, it delivers powerful purification without taking up much room.
Air filtration system
When it comes to effective air purification, an air purifier needs more than just a basic filter. The gold standard for an air filtration system includes a pre-filter, activated carbon filter, and True HEPA-13 filter. What are these filter layers for?
The pre-filter is the first layer of protection, trapping large particles like dust, pet hair, lint, and preventing them from clogging the main filters. This keeps the purifier running efficiently and extends the lifespan of the other filters.
The activated carbon filter absorbs odors, smoke, and VOCs by trapping them in its porous surface. It helps eliminate lingering smells from pets, cooking, and cigarette smoke, keeping your air fresh.
The true HEPA-13 filter does most of the heavy lifting, capturing 99.97% of airborne allergens like pollen, mold spores, pet dander, and dust mites. By removing these harmful particles, it helps relieve allergy symptoms like sneezing, congestion, and itchy eyes—so you can breathe easier every day.
The good news? Most decent to high-end air purifiers already have at least two of the three essential filter layers. But the bad news? In today’s world, this no longer cuts it—and that's where advanced technologies like the UV-C light comes in.
But unlike ionizers that can produce harmful ozone, UV-C light safely neutralizes bacteria and viruses at the DNA level, preventing their spread. This reduces illness risks, making it especially valuable for homes with children, elderly family members, or those with weakened immune systems.
The Sterra Moon combines the gold standard of filtration in its Triple-Layer Medical-grade Filtration System and the extra protection of its Advanced UV-C Light Tech to provide safe, powerful, and reliable air purification for your home.
Filter replacement
When buying an air purifier, filter replacement is a key factor that can impact both convenience and cost over time.Filters don’t last forever, and regular replacement is needed to maintain effective performance. Here’s what to consider: ease of replacement, filter life span, and replacement cost.
Ease of replacement: Some models make filter replacement easy, while others have hard-to-reach filters that require extra effort. For a hassle-free experience, choose one with a simple, tool-free design—because no one should struggle just to keep their purifier running.
Filter life span: This varies by model. Some need to be replaced in months, while others last a year or more. Longer-lasting filters save time and money, but durability shouldn’t compromise performance. A good rule of thumb is to choose filters that last at least 6–12 months for the best balance between durability and performance.
Replacement cost: The cost of replacement filters can sneak up on you if you’re not careful. Prices vary widely, with some high-end models requiring expensive filters that add up over time. Before buying, check the price of replacements and factor it into your budget alongside the purifier’s upfront cost.
The Sterra Moon comes with premium-quality air filters that are super easy to replace, and can last for up to 12 months. Not to mention, a replacement filter only costs $49, making it one of the best value air filters on the market.
Noise level
An often over-looked factor when choosing an air purifier is how loud it operates. While filtration performance is key, a loud air purifier can disrupt conversations, distract you during work, or even prevent you from getting a restful night’s sleep. This factor becomes especially critical in spaces where tranquility is a priority, such as bedrooms, baby's rooms, or home offices.
Most air purifiers run loudly, especially at higher fan speeds. Some models can reach over 50dB—about as loud as a normal conversation—making them disruptive in quiet spaces. Even those with lower noise settings may still produce an annoying hum or rattling sound over time.
A quiet air purifier makes a big difference, especially for sleep, focus, and relaxation. It blends seamlessly into your space, letting you work undisturbed, unwind in peace, or sleep deeply without the constant hum of machinery. This is especially valuable for babies, light sleepers, or anyone who values a calm atmosphere. With low noise operation, you get clean air without sacrificing comfort or serenity.
The Sterra Moon can operate at a whisper-quiet 20dB, making it perfect for home offices or rooms with babies, light sleepers, and anyone who values good sleep or focus. This exceptionally low noise level ensures that you can enjoy purified air without disruptive sounds, creating a peaceful and healthy environment for you and your loved ones. With the Sterra Moon, clean air and tranquility go hand in hand.
Exclusive offer
Most decent air purifiers come with hefty price tags, ranging from $500+ to $1,000+, and that’s before you even factor in additional costs. Need replacement filters? That'll be another $100 to $200, depending on the models. Looking for extra freebies? None to be found.
Our goal at STERRA has always been to make clean, healthy air accessible to everyone, which is why we're excited to introduce STERRA's Total Relief Bundle, bringing powerful air purification to more homes without the premium price tag.
For just $299, you'll get:
Sterra Moon Air Purifier (exclusive $200 off)
2 Free Air Filters (worth $98)
Free Shipping
With the Total Relief Bundle, you can save an extra $298 and unlock a lifetime of clean fresh air from the comfort of your own home.
Price
This is one of the biggest factors to consider when buying an air purifier.
Most air purifiers on the market come with hefty price tags due to brand markups and unnecessary features. A decent, well-known air purifier can easily cost over $500, while so-called "premium" models can easily go beyond $1,000.
Most decent air purifiers on the market range from $500+ to $1,000+
Contrary to popular belief, a higher price doesn’t always mean better quality and performance. Many high-end air purifiers add flashy features like proprietary technologies, multi-functional heating or cooling, or separate remote control—none of which significantly improve air quality but can skyrocket the price.
On the flip side, going too cheap can also be a mistake. Many budget air purifiers under $100 cut corners by using cheap materials, weak filters, and outdated technology, leading to poor performance, loud operation and frequent breakdowns.
The Sterra Moon delivers powerful air purification at a fraction of the cost. It packs industry-leading features that rival top-of-the-line models in a sleek and ultra-compact design for a market-beating $299 price.
This highly effective air purifier costs 40-78% less while sporting useful cutting-edge features that rival other top-of-the-line brands. Plus, our exclusive offer gives you an extra $298 in value!
Coverage area
Next we'll look at coverage area.
Depending on your room size, you’ll need an air purifier that can effectively cover a small, medium, or large space. In general, smaller purifiers are best for compact rooms, while larger models are designed to handle medium to spacious areas.
Many high-end air purifiers have surprisingly low coverage areas despite their high price tags. On the flip side, cheap air purifiers often struggle to clean even small rooms properly. Price doesn't always reflect performance—what really matters is how much space the purifier can effectively cover.
The Sterra Moon is designed to be sleek and ultra-compact while covering up to 615 sq. ft.—making it perfect for bedrooms, living rooms, home offices, and even studio apartments. Whether you need fresh air in a cozy space or a larger open area, it delivers powerful purification without taking up much room.
Air filtration system
When it comes to effective air purification, an air purifier needs more than just a basic filter. The gold standard for an air filtration system includes a pre-filter, activated carbon filter, and True HEPA-13 filter. What are these filter layers for?
The pre-filter is the first layer of protection, trapping large particles like dust, pet hair, lint, and preventing them from clogging the main filters. This keeps the purifier running efficiently and extends the lifespan of the other filters.
The activated carbon filter absorbs odors, smoke, and VOCs by trapping them in its porous surface. It helps eliminate lingering smells from pets, cooking, and cigarette smoke, keeping your air fresh.
The true HEPA-13 filter does most of the heavy lifting, capturing 99.97% of airborne allergens like pollen, mold spores, pet dander, and dust mites. By removing these harmful particles, it helps relieve allergy symptoms like sneezing, congestion, and itchy eyes—so you can breathe easier every day.
The good news? Most decent to high-end air purifiers already have at least two of the three essential filter layers. But the bad news? In today’s world, this no longer cuts it—and that's where advanced technologies like the UV-C light comes in.
But unlike ionizers that can produce harmful ozone, UV-C light safely neutralizes bacteria and viruses at the DNA level, preventing their spread. This reduces illness risks, making it especially valuable for homes with children, elderly family members, or those with weakened immune systems.
The Sterra Moon combines the gold standard of filtration in its Triple-Layer Medical-grade Filtration System and the extra protection of its Advanced UV-C Light Tech to provide safe, powerful, and reliable air purification for your home.
Filter replacement
When buying an air purifier, filter replacement is a key factor that can impact both convenience and cost over time.Filters don’t last forever, and regular replacement is needed to maintain effective performance. Here’s what to consider: ease of replacement, filter life span, and replacement cost.
Ease of replacement: Some models make filter replacement easy, while others have hard-to-reach filters that require extra effort. For a hassle-free experience, choose one with a simple, tool-free design—because no one should struggle just to keep their purifier running.
Filter life span: This varies by model. Some need to be replaced in months, while others last a year or more. Longer-lasting filters save time and money, but durability shouldn’t compromise performance. A good rule of thumb is to choose filters that last at least 6–12 months for the best balance between durability and performance.
Replacement cost: The cost of replacement filters can sneak up on you if you’re not careful. Prices vary widely, with some high-end models requiring expensive filters that add up over time. Before buying, check the price of replacements and factor it into your budget alongside the purifier’s upfront cost.
The Sterra Moon comes with premium-quality air filters that are super easy to replace, and can last for up to 12 months. Not to mention, a replacement filter only costs $49, making it one of the best value air filters on the market.
Noise level
An often over-looked factor when choosing an air purifier is how loud it operates. While filtration performance is key, a loud air purifier can disrupt conversations, distract you during work, or even prevent you from getting a restful night’s sleep. This factor becomes especially critical in spaces where tranquility is a priority, such as bedrooms, baby's rooms, or home offices.
Most air purifiers run loudly, especially at higher fan speeds. Some models can reach over 50dB—about as loud as a normal conversation—making them disruptive in quiet spaces. Even those with lower noise settings may still produce an annoying hum or rattling sound over time.
A quiet air purifier makes a big difference, especially for sleep, focus, and relaxation. It blends seamlessly into your space, letting you work undisturbed, unwind in peace, or sleep deeply without the constant hum of machinery. This is especially valuable for babies, light sleepers, or anyone who values a calm atmosphere. With low noise operation, you get clean air without sacrificing comfort or serenity.
The Sterra Moon can operate at a whisper-quiet 20dB, making it perfect for home offices or rooms with babies, light sleepers, and anyone who values good sleep or focus. This exceptionally low noise level ensures that you can enjoy purified air without disruptive sounds, creating a peaceful and healthy environment for you and your loved ones. With the Sterra Moon, clean air and tranquility go hand in hand.
Exclusive offer
Most decent air purifiers come with hefty price tags, ranging from $500+ to $1,000+, and that’s before you even factor in additional costs. Need replacement filters? That'll be another $100 to $200, depending on the models. Looking for extra freebies? None to be found.
Our goal at STERRA has always been to make clean, healthy air accessible to everyone, which is why we're excited to introduce STERRA's Total Relief Bundle, bringing powerful air purification to more homes without the premium price tag.
For just $299, you'll get:
Sterra Moon Air Purifier (exclusive $200 off)
2 Free Air Filters (worth $98)
Free Shipping
With the Total Relief Bundle, you can save an extra $298 and unlock a lifetime of clean fresh air from the comfort of your own home.
How the top brands compare
How the top brands compare
We designed the Sterra Moon to be the best air purifier offer on the market today.
We equipped it with top-tier filtration, a sleek and ultra-compact design, and all the cutting-edge features you need for powerful, hassle-free air purification—all at an ultra-competitive price.
Some highlights of our offer:
Just $299 for the Sterra Moon air purifier ($200 off)
Free 2 air filters (worth $98)
Free shipping
World-class customer support
A lifetime of clean and fresh air
If you want the full details, check out the table below. It summarizes all the key things to look out for when choosing an air purifier, and shows how the Sterra Moon compares to other top air purifier brands in the US.
The information in this chart is accurate at the time of writing, and is based on the information found on each brand's official website.
Contents
Introduction
1. Price
2. Coverage area
3. Air filtration system
4. Filter replacement
5. Noise level
6. Exclusive Offer
How the top brands compare
Free 2 Air Filters
Free Shipping
Free 2 Air Filters
Free Shipping
"Love the item, I can definitely feel the air quality difference in my room! Even my kids are sleeping better with the Moon. Thank you for such an awesome product. I highly recommend!"
- Brittney, USA
Verified
"Have been using Sterra for weeks and it has tremendously helped with my sinus and sneezing because I'm very allergic to dust and pet smells. It's light-weight and I can easily move to other rooms."
- Mariah, USA
Verified
"Used to have bad sinus issue on waking up. Since using the Sterra Moon, my sinus condition has greatly improved. It also takes a few minutes to clear up any unpleasant smells."
- Vickie, USA
Verified