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Detailed homeowner guides explain safe checks, possible causes and when to request professional diagnosis.
Search what you observe—not what you think the failed part is. Several HVAC faults can produce the same symptom, and an on-site diagnosis is often needed before choosing a repair.
15 matching answers
Clear filtersEPA generally recommends keeping indoor relative humidity around 30% to 50% to reduce moisture problems while maintaining comfort.
Possible causes include oversized equipment, short cycling, high outdoor moisture, ventilation/infiltration, low airflow or system control issues. Humidity problems should be diagnosed with temperature and moisture measurements.
Yes. An oversized system may satisfy the thermostat quickly and shut off before removing enough moisture, especially in humid conditions.
Filters can capture some airborne particles, but they do not fix the moisture source that allows mold to grow. Moisture correction and cleanup are essential.
EPA recommends addressing the moisture cause first. Wet or moldy internal duct insulation generally cannot be effectively cleaned and may need replacement; visible contamination should be properly evaluated.
EPA does not recommend routine duct cleaning for every home. It may be considered when there is substantial visible mold, vermin infestation, or excessive debris being released from ducts.
Evidence that cleaning ducts alone improves system efficiency is limited. Cleaning certain HVAC components may help when they are dirty, but sealing leaks and correcting airflow often have clearer efficiency value.
Whole-house ventilation uses fans and ducts to provide controlled outdoor-air exchange. Common approaches include exhaust, supply, balanced and energy-recovery systems.
A tighter building reduces uncontrolled air leakage, which saves energy but can allow indoor pollutants to accumulate. Controlled ventilation helps manage fresh-air exchange.
An energy-recovery ventilator exchanges stale indoor air with outdoor air while transferring some heat and, depending on design, moisture between air streams to reduce ventilation energy penalty.
A heat-recovery ventilator exchanges indoor and outdoor air while transferring heat between the air streams. It provides ventilation with less heating/cooling energy loss than uncontrolled ventilation.
Condensation can occur when a cold surface falls below the dew point of surrounding humid air. Causes can include high indoor humidity, duct insulation problems, air leakage or very cold supply conditions.
Condensate drains carry moisture removed during cooling. Slime, debris, improper slope or drain design can cause repeated clogs; recurring problems should be corrected rather than only cleared repeatedly.
Yes. Inadequate outdoor-air exchange can allow pollutants and odors to accumulate. Source control, local exhaust and whole-house ventilation are common strategies.
Natural ventilation can help when outdoor conditions are suitable, but it is uncontrolled and may be impractical during heat, smoke or poor outdoor air quality. Mechanical ventilation provides more predictable airflow.
Equipment condition still requires professional evaluation. For regulations, rebates and efficiency guidance, Heco checks authoritative sources and identifies items that can change.
Tell Heco the symptom, equipment type, property type and location. We will help identify the next practical step.