Heco Answer Center

711 HVAC Questions, Answered Clearly

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Heating troubleshooting

No heat? Start with your symptom.

Detailed homeowner guides explain safe checks, possible causes and when to request professional diagnosis.

Furnace Not Blowing Heat

Cold air, weak airflow or heat that stops? Understand the differences before assuming a part has failed.

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Furnace won't start? Start with these safe checks.

Understand a blank thermostat, a silent furnace or heat that stops—and know when to call Heco.

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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.

10 matching answers

Clear filters

Follow the equipment and filter manufacturer's instructions, and inspect regularly rather than relying on one universal replacement interval. Dust, pets, smoke and heavy use can require earlier checks. With equipment off, replace a loaded filter with the correct compatible type. Heco's reminder planner helps track checks; a reminder interval is not a guaranteed filter lifespan.

Reviewed by Heco HVAC Reference basis: Reviewed Heco test knowledge

No. MERV 13 is not the highest rating; the MERV scale extends to 16. A higher number does not automatically suit every system. Size, depth, filter design and pressure drop matter. Heco can help evaluate a compatible filter and airflow before an upgrade.

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No. MERV 16 is not suitable for every furnace or filter rack. The blower and filter arrangement must handle the filter's pressure drop at required airflow. Follow manufacturer limits and have compatibility assessed; do not force a high-rated filter into a system because the dimensions fit.

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A loaded filter can restrict airflow, reduce heating/cooling performance and contribute to overheating, icing or protective shutdowns. Depending on the equipment and fault, components may be stressed. It does not prove a motor is damaged. Heco can check the filter arrangement and airflow if performance problems continue.

Reviewed by Heco HVAC Reference basis: Reviewed Heco test knowledge

It can, depending on the filter's design, depth, area, loading and the system's available pressure. MERV alone does not determine resistance. Use a compatible filter that preserves required airflow; Heco can evaluate the system rather than recommending the highest rating automatically.

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Look for the size printed on the existing filter and confirm it against the equipment/filter-rack instructions. Nominal printed size and actual measured dimensions can differ. With equipment off, inspect only a safely accessible filter. Do not force a different size or leave gaps; ask Heco if the existing filter fit seems wrong.

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No. An ordinary HVAC particle filter does not make a gas leak or carbon monoxide hazard safe. For gas odor or a CO alarm, leave immediately and contact emergency services or the utility from a safe place. Do not keep troubleshooting or wait for a routine HVAC booking.

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This chat has not created a filter reminder or saved a schedule. Use Heco's filter guide/reminder planner and its available save or calendar options. Follow equipment instructions and actual filter condition; a planned check date does not guarantee filter lifespan.

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Heco can assess HVAC filtration and airflow as part of indoor air quality service. Compatible filtration and appropriately sized portable particle air cleaners can reduce indoor smoke particles, but they do not eliminate every pollutant or replace public-health guidance. Follow local smoke advisories and discuss system compatibility before raising the filter rating.

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No. Do not remove the filter as an airflow fix. Use the correct compatible filter as the equipment instructions require. Missing filtration can let debris collect on internal components. Poor airflow needs evaluation of filter fit, loading, ductwork and equipment rather than running unfiltered.

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Trusted references

Official information behind our guidance

Equipment condition still requires professional evaluation. For regulations, rebates and efficiency guidance, Heco checks authoritative sources and identifies items that can change.

SMUD heating and cooling rebatesCurrent eligibility, equipment and funding requirements.

California HERS ProgramOfficial testing and compliance information.

ENERGY STAR maintenance checklistHomeowner and contractor maintenance guidance.

EPA refrigerant transitionCurrent federal equipment and refrigerant information.

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