Does Furnace Reduce Humidity? A Comprehensive Analysis

Rima Chatterjee

In this discussion, we will explore the relationship between humidity and combustion furnaces in detail.

Can a Furnace Reduce Humidity in Your Home?

To maintain a comfortable home, you need to ensure the temperature and humidity levels are just right. In order to achieve this, you may have considered using a furnace. 

Does Furnace Reduce Humidity

Relationship Between Humidity and Combustion Furnaces

Combustion furnaces can keep our homes warm in winter and they affect humidity based on their efficiency.

 Let’s explore this relationship.

Furnace TypeHumidity ImpactDescription
High-Efficiency FurnaceCan reduce humidity by extracting heat from glasses.Humidifiers and dehumidifiers are more important for regulating indoor humidity. 
Low-Efficiency FurnaceMay add humidity as it releases moisture.Low-efficiency furnaces emit greenhouse gasses, causing climate change. 

Atmospheric Combustion Furnaces and Their Impact on Indoor Air Quality

Atmospheric combustion furnaces are essential for heated homes. They burn natural gas to create heat energy. But, these furnaces can affect indoor air quality

  • They produce carbon monoxide (CO), nitrogen oxides (NO) and other pollutants. If not maintained or installed correctly, they can make CO levels dangerously high. 
  • This may lead to health problems like headaches, nausea, vomiting and even death. Poor air quality can also trigger asthma and worsen respiratory issues.
  • A furnace does not directly reduce humidity, but it has a big role in keeping air quality good. 
  • Poor air quality is both uncomfortable and risky for your family’s health. 
  • Regular maintenance and upgrades to high-efficiency heating systems are important. Also, you should make sure that harmful gasses are vented outside of your home.
  • A family recently found out how bad their furnace was after experiencing days of headaches and dizziness. They could have prevented this if they had taken care of their furnace.
  • It is essential to understand how atmospheric combustion furnaces affect indoor air quality. 
  • Proper installation, maintenance and safety regulations are essential for keeping families safe during colder weather.

How Furnaces Affect Relative Humidity in Your Home?

To understand how your furnace affects the humidity levels in your home, let me tell you about the role of water vapor and outside air. 

Knowing this can help you adjust the humidity level in your house effectively. Another factor is how cold outside temperatures can lead to dry air in your home. 

Role of Water Vapor and Outside Air in Humidity Levels

Water vapor and outside air have a big impact on the humidity of your home. If you live in a high humidity area, your furnace can make things worse. 

Warm air can hold more moisture than cold air, so when your furnace heats up the air, it reduces humidity.

But, you can control the humidity levels with a humidifier. It can help keep the relative humidity in an acceptable range

Not only does this provide comfort, but it also has health benefits like lessening the chance of respiratory infections and allergies.

It’s important to remember that either too much or too little humidity can harm furniture, walls, electronics, and your health. 

An unmaintained furnace can result in dry skin, breathing troubles, or make certain conditions worse. 

Maintenance of your furnace system and humidifier can help keep humidity stable and keep health issues away.

How Cold Temperatures In Surrounding Result in Dry Air in Your Home?

When the cold weather arrives, your home’s humidity levels drop. This can lead to respiratory issues and other health problems. This is because cold air can’t hold as much moisture as warm air.

A furnace is the perfect solution. It adds moisture to the air by heating it through a ventilation system. 

Gas and electric-powered furnaces are available. A professional can help decide which is best for you.

Usage For Heating: Gas Furnace Vs.  Combustion Furnace 

Gas furnaces and combustion furnaces are two types of HVAC systems. They both heat residential and commercial places but differ in operation. 

Let’s explore the differences.

Gas FurnaceCombustion Furnace
Gas furnaces are highly efficient, with AFUE ratings from 80% to 97%.Combustion furnaces are less efficient, with AFUE ratings under 80%.
Gas furnaces burn cleaner, producing less carbon dioxide.Combustion furnaces produce exhaust gasses and require an exhaust system to avoid air pollution.
Gas furnaces need maintenance once or twice a year and have fewer components. Combustion furnaces require frequent cleaning of flue gas passages and exhaust ports.
Gas furnaces are more efficient and produce less pollution.Combustion furnaces need regular cleaning to maintain efficiency.

Impact on Indoor Humidity: Sealed Vs. Atmospheric Combustion Furnaces 

Furnaces can keep homes warm in colder months. But, the type of furnace can change indoor humidity levels. 

Sealed furnaces are more efficient, but require expensive direct venting. Whereas, atmospheric furnaces draw in air from outside, increasing humidity.

Let’s compare sealed and atmospheric combustion furnaces.

Sealed Combustion FurnaceAtmospheric Combustion Furnace
Direct ventingNatural draft
Indoor airCombustion air drawn from outside
Higher efficiencyLower efficiency
Less humidified air recirculated at home.More humidified air recirculated at home.

Negative Effects of Low Indoor Humidity

Low indoor humidity can have serious, bad effects on your health and home. You may have dry skin, static electricity, and respiratory problems.

It’s important to maintain the right levels of humidity. The ideal range should be 30-50%, with many recommending 45%. 

Having the right humidity helps with allergies, asthmatic attacks, skin health and more.

These are uncomfortable, but the harm goes deeper.

Dry skin

Low humidity evaporates the moisture from your skin, making it flaky and itchy. It may even cause painful eczema.

Static electricity

Low humidity builds up charges on you, furniture and electronics. This sparks shocks and fires.

Respiratory problems

Dry air dries out your nasal passages. This means less mucus to trap bacteria and viruses. You could be more likely to get sick.

Damaged interiors

Low humidity warps and cracks wooden floors and furniture. Walls may have cracks from shifting foundations due to low moisture.

Positive Impact of Ideal Indoor Humidity Levels on Home Comfort and Health

Proper humidity has a big effect on both home comfort and health. Keep your home’s humidity level between 30%-50% to help with breathing issues, stop mold growth, and avoid pests. 

Low humidity can dry skin and create static electricity, while high humidity helps dust mites and mold grow.

To maintain ideal indoor humidity levels, get a quality humidifier or dehumidifier

Check and adjust your thermostat settings, have good ventilation throughout the home, and fix any water leaks or damage quickly.

Plants can also help regulate indoor humidity. They look great and are beneficial for health. Certain species like Boston ferns and spider plants absorb excess moisture in the air.

Take steps to monitor and manage your home’s humidity level to improve comfort and keep you and your family healthy. 

How to Control Indoor Humidity Levels?

To control indoor humidity levels and combat the negative effects of dry air like static electricity and dry skin, there are several solutions you can consider. 

Try using a whole-home system, including a furnace humidifier and proper ventilation. Additionally, you may benefit from using a portable humidifier in your bedroom at night.

Using a Whole-Home System, Including a Furnace Humidifier and Proper Ventilation

Maintaining the right indoor humidity is key for a healthy living space. Utilizing a Whole-Home System with a Furnace Humidifier and the right Ventilation will help you achieve this. 

Plus, the HVAC system needs to be kept in good condition – check ductwork for leaks or blockages every once in a while!

Benefits of Using a Portable Humidifier in Your Bedroom at Night

A portable humidifier in your bedroom at night brings many advantages. It adds moisture to the air, especially in winter or dry climates. 

This can help breathing, and reduce dry skin, eyes, and throat.

Here are some of its benefits:

Snoring lessens Higher humidity levels lubricate nasal passages, making breathing easier.
Respiratory diseases can be preventedDry air can cause asthma, bronchitis, or pneumonia. More humidity stops bacteria and viruses spreading.
Sleep quality increasesNo more coughing or congestion to interrupt peaceful sleep.

Common Issues That Can Affect Indoor Humidity Levels

To make sure your house has the right amount of humidity, you must know the common issues that can affect indoor humidity levels. 

Leak, Condensation, and Crack Issues in Your Home

Humidity levels in your home can be affected by many causes. These can include leakage, condensation, and cracks. 

All of these will cause discomfort, health problems, and property damage. Poor ventilation is the main reason for such issues.

To fix a leak, you must first locate it. Inspect pipes and fixtures. A dehumidifier or moisture absorber might be needed in areas with water accumulation. 

For condensation, proper insulation and ventilation are essential.

Cracks in walls, windows, or doors can let in outside air, which affects temperature and humidity. Seal all cracks with weather-stripping or caulking.

When humidity levels drop during winter, a humidifier can help. This device adds moisture to the air, making your home more comfortable.

Oversizing of Furnaces and Their Impact on Indoor Moisture Content

Furnaces that are too big for the space can cause a lack of moisture in the air. This is bad news, as it can lead to discomfort, damage household items, and affect skin and respiratory health.

To prevent this, get professionals to do a load calculation. This takes into account insulation, ducts, windows, and more.

How to Maintain Optimal Indoor Humidity Levels?

To maintain optimal indoor humidity levels in your home, regular maintenance and tune-ups of your furnace and home system are crucial. 

Regular Maintenance of Your Furnace and Home System

Maintaining and tuning up your furnace and home system is essential to keeping optimal indoor humidity levels. 

Ignoring it can cause air quality issues, expensive energy bills, and costly repairs. 

Here are the four steps to follow for regular maintenance and tune-ups:

  1. Check and clean or replace the air filter.
  2. Inspect the blower motor lubrication and belt condition annually.
  3. Get a professional cleaning, inspection, and tune-up yearly by a licensed technician.
  4. Ensure insulation of all ductwork, seal leaks in the air ducts, clean registers, and keep dryer vents functioning.

Tune-Ups of Your Furnace and Home System

To reach optimal indoor humidity levels, try these:

  • Use HRV or ERV to introduce fresh air.
  • Invest in a whole-house humidifier if you live in low-humidity areas.
  • Make sure your attic has the correct insulation.
  • Check for leakages around windows, doors, piping, and fix water damage ASAP.

Advantages of a Home Comfort Advantage Program Agreement

A well-functioning HVAC system is essential for home comfort. The Home Comfort Advantage Program Agreement offers many benefits to homeowners who want to keep their heating and cooling systems in good condition.

Regular Maintenance

Get regular maintenance services to help prevent damage and extend your system’s life.

Priority Service

In case of a breakdown, program members have priority over non-members.

No Overtime Charges

No extra charges for emergency repairs.

Savings on Repairs

Enjoy flat rate pricing for repairs done as part of the program.

Professional Technicians

Certified technicians provide professional and timely services.

Detailed Reports

Get a detailed report after each visit, showing what has been done and what needs attention.

Discounts and Warranty

Get exclusive discounts on new equipment purchases and an extended warranty.


You should aim for a humidity level between 30% – 50%. Low humidity causes things like dry lips and skin irritation. High humidity leads to mold growth and allergy symptoms. To keep humidity levels regulated, maintain your furnace system and add a house humidifier.

About the author

Debarghya Roy: A heating systems author, Passionate about energy efficiency and sustainability, Sharing insights and empowering readers through informative blog articles.