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Frequently Asked Questions for Residential Customers

Fresh Air Technologies is committed to providing exceptional Charlotte mold remediation and other residential services to our new and existing customers. Our goal is to make sure that you can get the information that you need to make an informed decision. We want our customers to feel as comfortable as possible when working with Fresh Air Technologies. We have compiled a list of frequently ask questions and provided the answers in this section of our website. We hope you find this information insightful and helpful. Our trained and knowledgeable staff can easily be reached by calling our office or by completing an online service request form.


What is your warranty on your work?

We offer a one year labor and materials warranty on all of our services. Some products carry a longer manufacturer’s warranty.

Do you offer a financing plan?

Yes. One year, same as cash, financing plan through an independent finance company. This is available for all of our services.

How far do you travel for a job?

Our crews can travel up to 50 miles from our office in Matthews, North Carolina.

What if I live in a home that I do not own?

If you are the renter of a home that you do not own than you would need to put us in touch with the homeowner or property manager. He/she would have to approve any and all work being done to the home as well as agree to provide payment for that work.

Do I need to be home during the estimate?

No. You do not need to be home during an estimate. However, you do need to provide us access to your home. We prefer that customers are home during an estimate to answer any questions that we may have. We also like to take time to explain the treatment process.

I am building a new house. Can you work with my builder?

Yes. We work with several builders in the Charlotte area. Simply e-mail us your builder’s contact information and we will contact him or her to get a copy of the blueprints.

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Fresh Air’s Qualifications


CMR – Certified Mold Remediator

Professional Affiliations

NADCA – National Air Duct Cleaners Association
NARI – National Association of the Remodeling Industry

Industry Ratings


Angie’s List A


We are fully insured. We carry both workers comp and liability.

Air Ducts


How often should I have my air duct cleaned?

If you system has a filter located at the return grill we recommend air duct cleaning once every 7 to 10 years. If your filter is located at the unit then once every 3 to 5 years. Air ducts with filters on the unit typically accumulate dust and debris faster than those with the filters at the return girl. This is why we recommend more frequent cleaning for those types of systems.

What type of filter should I be using?

When choosing a filter you want to play it safe. You want the filter to clean the air but not restrict the airflow. A MERV 11 pleated filter should work in most systems. Consult your HVAC contractor if you want to be more aggressive with your air filtration. We have a variety of filters available right here on our website on the home page.

Do I have to be home during this project?

No you do not need to be home but you do need to provide access. We do need you or your representative to be home on the final day of the project so that we can receive the final payment and do a project walkthrough

How messy is this process?

Most of our work is not messy however some of the work may need to take place in your home. We will clean up after each work day; however, you may have some restricted access to our work areas if remediation is involved.


Where does the radiant attic barrier go?

The attic barrier is installed on the knee wall and the butt ends of roof rafters in your attic.

What will be the temperature reduction in the attic once the barrier is installed?

Average temperature reduction will be between 30-50 degrees Fahrenheit.

How much will this lower my energy bills?

After installation of the attic barrier you will see a 10-15% reduction in your monthly energy bill.

Do I still need attic insulation if I install a radiant barrier?

Yes. During the winter you want to capture the radiant heat and keep it in the home. The attic is not an occupied space so you want to keep the cold temperatures from affecting the temperature of the drywall on your ceiling.

Will I regain the use of my attic for storage?

Yes. The lowered temperature of the attic makes it ideal for storing items. There is will be no damage to items stored due to excessive hot or cold air entering the attic.


What is the current code for blown-in attic insulation?

R38. What does that mean? According to, Insulation levels are specified by R-Value. R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.

Does blown-in insulation create a dust problem in my house?

Yes. But we can fix it. Some blown-in insulation create dust. Mostly linked to pressurization problems in the house. Gaps around the can lights and pipe chases, penetrations can allow insulation fibers to be dragged into your house as air flows from attic to the house. To solve this problem we can air seal your attic as well as fix your pressurization problem.

Roughly how many inches equal R-38?

Insulation depths vary by type and manufacturer of the insulation. The average for depth is 16 inches

When do I need to replace my attic insulation?

There is no report saying that attic insulation needs to be replaced after a certain number of years used. If insulation becomes damaged from moisture problems or animal infestation problems, then we recommend changing the insulation immediately. You would replace the insulation if it becomes compressed.

Is it a good idea to seal the attic access door?

Yes. The attic access door allows hot air from the attic to enter to occupied space in the summer months and cold air to enter the occupied space in the winter months. Driving up both heating and cooling costs. Sealing this door will eliminate that problem.


What is a normal humidity level for my crawlspace?

In an open crawlspace design your relative humidity will be equal to or slighty higher than the outside. In a closed or conditioned crawlspace your relative humidity will be between 30 and 50%

Do I really NEED a dehumidifier?

You must have some way to control the humidity in the crawlspace. In a closed or sealed crawlspace you can use a dehumidifier or a baffle can be installed in the supply ductwork to control both the humidity and temperature. NEVER install a dehumidifier in a crawlspace that is vented to the outside. Your only result will be a high energy bill.

How does water get into my crawlspace?

Water can enter the crawlspace in several ways:

  • • Through an improperly sealed crawlspace door
  • • Wind driven rain through open crawlspace vents
  • • Condensation dripping off exposed ductwork
  • • Through your foundation walls due to cracks and failed or missing waterproofing
  • • As a result of a pipe break or flooding in the house above the crawlspace

Will mold come back after you clean it?

Mold will return if you do not address the cause of the moisture problem. Mold needs two conditions in order to grow. Wood moisture content above 20% or a relative humidity reading consistently over 60%. Take out those two variables and you will not see mold return.


How can I tell if my foundation has been waterproofed?

You can go to any exterior foundation wall and dig down about one foot. If you do not see a black paint like substance or a plastic barrier, then you do not have waterproofing.

How does a French Drain work?

A French drain is placed along the foundation wall next to the footer on either the inside or outside of the foundation wall. French Drains are designed to carry water away from the foundation wall to a low spot in the yard or to a sump pump located in a low spot in the crawlspace or basement.

How do you determine whether to put the drain on the inside or outside?

Ease of access and cost feasibilities are what determine the location of the drain in your home. If you have heavy landscaping or amenities such as walkways, outdoor furniture or decking around the foundation of your house the access to the wall can become difficult and costly. In this case we would recommend putting the drain on the inside on your home.

What is the warranty on the sump pump?

Manufacturer’s warranty for the sump pump that we use is three years.


What is dry ice blasting?

Dry ice blasting is similar to sand blasting, plastic bead blasting, or soda blasting where a medium is accelerated in a pressurized air stream to impact a surface to be cleaned or prepared. But that’s where the similarity ends. Instead of using hard abrasive media to grind on a surface (and damage it), dry ice blasting uses soft dry ice, accelerated at supersonic speeds, and creates mini-explosions on the surface to lift the undesirable item off the underlying substrate. Here we have a video featuring the dry ice blasting process.

What is the difference between dry ice blasting and other mold removal techniques?

Dry ice blasting has many unique and superior benefits over traditional cleaning methods as other cleaning methods can be toxic:

  • • Sand, soda, or water blasting can leave toxic secondary waste to be cleaned up in addition to the toxic substrate
  • • Sand, soda, or water blasting can create downstream contamination that effects surrounding installations
  • • Soda blasting can kill surrounding vegetation
  • • Chemical and solvent cleaning methods are toxic, which creates toxic waste to be disposed of
  • • Workers are exposed to potentially harmful substances through the use of chemicals and solvents

Is dry ice blasting safe and effective?

Yes! Dry ice blasting is clean and safe.

  • • Dry ice is an approved medium by the EPA, USDA & FDA, and is non-toxic, non-hazardous and inhibits mold & bacteria growth
  • • Dry ice blasting has been effectively used in EPA, USDA, FDA, AIB and GFSI inspected/certified facilities
  • • Dry ice blasting is safe to use with food processing equipment
  • • Dry ice blasting does not release harmful gases into the atmosphere
  • • Dry ice blasting does not generate secondary waste
  • • Dry ice blasting is safe and non-toxic (once particles impact the surface they dissipate into the atmosphere)
  • • Dry ice blasting reduces or eliminates employee exposure to (and corporate liability from) the use of dangerous chemical cleaning agent

Can I be in the house while you are blasting?

Yes. Using dry ice blasting in the crawlspace does not deplete any oxygen or create any discomfort in the home during the process.

Additional questions…

If you still have questions about Dry Ice Blasting, we recommend visiting the Cold Jet website for all information dry ice blasting related.


What is the difference between a vapor barrier and a sealed crawlspace?

Vapor barrier is a 6-10 mil polymer only applied to ground, the seams are over lapped but not sealed, and the vents remain open. A sealed crawlspace uses a 15 mil 3 layer fiber reinforced polymer, applied to ground, walls and piers. We overlap polymer and tape seems with water resistant tape. Vents are sealed with an insulating foam board and all penetrations to the outside are caulked to prevent air and moister infiltration. A dehumidifier is installed once crawlspace is sealed to control relative humidity.

Why do the vents to the crawlspace need to be sealed?

Leaving vents open allows warm humid air into the crawlspace. Humid air interacting with cold surfaces in crawlspace can lead to mold and moisture problems.

Will a sealed crawlspace solve my mold and moisture issues in my crawlspace?

Yes. A properly installed sealed crawlspace will eliminate the two main contributors to mold and moisture problems. Sealing the vents eliminates the humidity and covering the ground eliminates ground moisture.

What are the benefits of sealing my crawlspace?

Sealing your crawlspace improves the energy efficiency of your heating and air conditioning system and improves indoor air quality. It will also increase the resale value of your home.

Is there a crawlspace too low to seal?

Yes. Your crawlspace must be at least 24 inches high. Anything lower than that will make it impossible for our crews to work in.

Can I use my crawlspace for storage once sealing is complete?

Yes. By controlling the relative humidity and temperature of the crawlspace you create a usable storage area the size of the first floor of your house.

Take advantage of Fresh Air Technologies’ knowledge and expertise by scheduling your FREE estimate today! Simply contact us using the button below or by giving us a call. We look forward to hearing from you soon and thank you for choosing Fresh Air Technologies!

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