top of page
KB'S HVAC Portland TN.png

Most Trusted HVAC Experts. Experience the difference with KB's HVAC

Where your comfort is our priority

Heating, Air Conditioning &  Ventilation Systems Repair & Replacement Contractor (HVAC) 

- For Your Home or Business -



guy working on an ac unit

Our Affordable HVAC Services


   - Installing heating systems (furnaces, heat pumps, boilers).
   - Installing air conditioning systems (central air conditioning, ductless mini-split systems).
   - Installing ventilation systems.


   - Regular inspection and maintenance of HVAC systems.
   - Cleaning and replacing air filters.
   - Checking and adjusting thermostat settings.
   - Lubricating moving parts to ensure smooth operation.
   - Inspecting and cleaning ductwork.

   - Heat Repair


   - Diagnosing and fixing issues with heating and cooling systems.
   - Repairing or replacing faulty components (fans, compressors, thermostats, etc.).
   - Fixing leaks in refrigerant lines.
   - Addressing issues with airflow and ventilation.

Ductwork Services:

   - Designing and installing ductwork for proper airflow.
   - Sealing and insulating ducts to improve energy efficiency.
   - Repairing or replacing damaged ducts.

Indoor Air Quality (IAQ) Services:

   - Installing air purifiers and cleaners.
   - Providing solutions for humidity control.
   - Offering ventilation improvements for better indoor air quality.

Energy Efficiency Upgrades:

   - Recommending and installing energy-efficient HVAC systems.
   - Upgrading thermostats and controls for better energy management.

Consultation and System Design:

   - Offering advice on selecting the right HVAC system for a specific space.
   - Designing custom HVAC solutions for homes or commercial buildings.

Upgrades and Retrofitting:

   - Upgrading outdated systems for improved efficiency.
   - Retrofitting older buildings with modern HVAC systems.

Smart Home Integration:

    - Integrating HVAC systems with smart home technology for remote control and automation. 

Geothermal Systems:

    - Installing and maintaining geothermal heating and cooling systems.


1466 AB Wade Rd

Portland, TN. 37148





  • Facebook

Frequently Asked Questions about HVAC Issues

If cold air is blowing out of your air conditioning (AC) unit while the heating is on, there could be several reasons for this issue. Here are some possible explanations: ​ Thermostat Settings: Check your thermostat settings to ensure that it is set to the heating mode. Sometimes, users may inadvertently set the thermostat to cooling or a fan-only mode, causing cold air to blow. ​ Thermostat Malfunction: If the thermostat is malfunctioning, it may not be accurately reading the temperature or sending the correct signals to the heating system. This can result in the AC continuing to run even when heating is required. ​ Reversing Valve Issues: Heat pumps have a component called a reversing valve that switches the unit between heating and cooling modes. If the reversing valve is stuck or malfunctioning, it can cause the unit to blow cold air during the heating mode. ​ 4. Dirty or Clogged Air Filters: A dirty or clogged air filter can restrict airflow, causing the heating system to overheat and shut down temporarily. When this happens, the system may default to blowing cold air. ​ 5. Issues with the Ductwork: Leaks or blockages in the ductwork can lead to a mix of hot and cold air being distributed throughout the house. Inspect the ducts for any visible issues. ​ 6. Malfunctioning Components: Various components within the heating system, such as the blower motor, thermostat sensor, or control board, could be malfunctioning and causing the issue. ​ It's advisable to consult with a professional HVAC technician  to diagnose and address the specific problem with your heating system. They can perform a thorough inspection and identify the root cause of the issue, ensuring that your heating system operates correctly and efficiently.

A thermostat may fail to work for various reasons. Here are some common causes: ​ 1. Dead Batteries: Many thermostats rely on batteries for power. If the batteries are dead, the thermostat won't function. Check and replace the batteries if necessary. ​ 2. Incorrect Settings: Ensure that the thermostat is set to the correct mode (heating or cooling) and the desired temperature. It may not turn on if the settings are incorrect. ​ 3. Tripped Circuit Breaker: Check the circuit breaker to make sure it hasn't tripped. If the thermostat is not getting power, it won't be able to control the heating or cooling system. ​ 4. Dirty or Dusty Components: Accumulation of dirt or dust on the thermostat's internal components can interfere with its proper functioning. Clean the thermostat and its components carefully. ​ 5. Faulty Wiring: Check for any loose or disconnected wires. If the wiring is damaged or not properly connected, the thermostat may not be able to communicate with the heating or cooling system. ​ 6. Malfunctioning Sensor: The thermostat uses a temperature sensor to detect the current temperature. If the sensor is faulty, it may not accurately gauge the temperature, leading to improper heating or cooling. ​ 7. System Compatibility Issues: Ensure that the thermostat is compatible with your heating or cooling system. Using an incompatible thermostat can result in operational issues. ​ 8. Software or Firmware Issues: Some modern thermostats have software or firmware that may need updates. Check if there are any available updates and follow the manufacturer's instructions to update the thermostat. ​ 9. Mechanical Failure: Over time, mechanical components within the thermostat can wear out or break. If this happens, the thermostat may need to be replaced. ​ 10. External Interference: Electronic devices or appliances near the thermostat may cause interference. Move any potential sources of interference away from the thermostat. ​ If you've checked these common issues and the thermostat still doesn't work, it may be time to consult with a professional HVAC technician or contact the thermostat manufacturer for further assistance.

There could be several reasons why air is not blowing out of your vents when the heat is running. Here are some common issues to check: ​ 1.Thermostat Settings: Ensure that the thermostat is set to the desired temperature and mode (heat). If the thermostat is not set correctly, the system may not turn on. ​ 2. Circuit Breaker: Check the circuit breaker for your heating system to make sure it hasn't tripped. If it has, reset it and see if that resolves the issue. ​ 3. Air Filter: A clogged or dirty air filter can restrict airflow, causing the system to shut down or not function efficiently. Check and replace the air filter if necessary. ​ 4. Pilot Light/Ignition Issues (for gas furnaces): If you have a gas furnace, ensure that the pilot light is lit or that the ignition system is working properly. If not, consult your furnace's manual for instructions or consider calling a professional. ​ 5. Thermocouple Issues (for gas furnaces): The thermocouple is a safety device that shuts off gas flow if it detects a pilot light failure. If the thermocouple is faulty, it may be preventing the furnace from staying on. A professional may need to replace it. ​ 6. Blower Motor: The blower motor is responsible for circulating air through the ducts. If it's not working, you won't feel any air coming from the vents. Check for any strange noises or lack of movement from the blower motor. A malfunctioning motor may require professional attention. ​ 7. Ductwork Issues: Inspect the ductwork for any blockages, leaks, or disconnected sections. Poorly maintained or damaged ducts can hinder the distribution of heated air. ​ 8. System Pressure: If you have a hydronic (hot water) heating system, check the system pressure. Low pressure can prevent the system from circulating hot water effectively. ​ 9. System Malfunction: There could be an issue with the heating system itself, such as a faulty control board, pressure switch, or other components. In such cases, it's advisable to consult with a professional HVAC technician to diagnose and address the problem. ​ If you're unable to identify or resolve the issue on your own, it's recommended to contact a licensed HVAC technician for a thorough inspection and repair. Heating systems involve potentially hazardous components, so if you're not comfortable troubleshooting or making repairs, seek professional assistance.

Water leaking from your attic HVAC (Heating, Ventilation, and Air Conditioning) unit can be caused by various issues. Here are some common reasons: ​ 1. Clogged Condensate Drain Line: The condensate produced during the air conditioning process should drain away through a dedicated line. If this line becomes clogged, water can back up and leak into your attic. Cleaning the drain line is a common maintenance task. ​ 2. Condensate Pan Issues: The HVAC unit has a condensate pan that collects water. If this pan is damaged or not level, it may not properly collect and drain the water, leading to leaks. ​ 3. Dirty or Clogged Air Filter: A dirty or clogged air filter can restrict airflow over the evaporator coils, causing the coils to freeze and eventually thaw, resulting in excess water. Regularly changing or cleaning your air filter is crucial. ​ 4. Frozen Evaporator Coils: If the refrigerant level is low or if there are issues with the airflow, the evaporator coils can freeze. When they thaw, excess water can drip into the condensate pan and potentially overflow. ​ 5. Improperly Installed or Damaged Condensate Pump:** Some HVAC systems use a condensate pump to move water away from the unit. If the pump is not working correctly or if it's damaged, it can lead to water leaks. ​ 6. Leaking Refrigerant: In rare cases, a refrigerant leak can cause ice to form on the evaporator coils. When the ice melts, it may result in water leakage. ​ 7. Disconnected or Leaking Drain Line: Check the drain line for any disconnections or leaks. A loose or damaged drain line can allow water to escape. ​ If you're not comfortable troubleshooting or fixing these issues yourself, it's advisable to contact a professional HVAC technician to assess and address the problem. Water leaks can lead to structural damage and mold growth, so it's essential to address the issue promptly.

Thanks for submitting!

To Schedule Your Free Quote for all your HVAC needs get in touch with us today. 


1466 AB Wade Rd

Portland TN 37148


Opening Hours

Mon - Fri

8:00 am – 5:00 pm





bottom of page