615 HVAC Questions, Answered Clearly

Yes. California customers can verify license status and classification through CSLB. The company name on the proposal should match the contracting entity doing the work.

Confirm the qualifying equipment combination, utility territory, participating-contractor requirement, permit/HERS steps, whether the incentive is reserved or post-paid, and what happens if program funding changes.

Only when the program structure and contractor process support it. Otherwise rebates may be paid later and remain contingent on eligibility, inspections or funding; the proposal should explain this clearly.

Separating required code/system work from optional comfort or efficiency upgrades lets the homeowner compare choices without mistaking an upgrade for a mandatory repair.

It should mean the customer sees the price and defined scope before approving work. It does not eliminate the need to explain how additional unforeseen work will be handled if new conditions are discovered.

A second opinion is an independent review of a major diagnosis or replacement recommendation. The value is highest when the second contractor receives the first findings and performs its own verification rather than simply underbidding.

For a major system investment, comparing multiple written scopes can help reveal differences in sizing, duct/electrical work, equipment, warranty and permit handling. Compare equivalent scope, not just total price.

Ask how to use the thermostat, where/when to change filters, what normal operation sounds like, what maintenance is expected, how warranty registration works and where permit/commissioning documents are stored.

A gas/electric package combines gas heating and electric cooling in one outdoor cabinet. Replacement planning must account for gas, electrical, duct and roof/ground installation conditions.

A packaged heat pump contains the main refrigeration and air-moving components in one outdoor cabinet and provides both heating and cooling. It is common in some homes and light-commercial applications.

Often possible, but electrical capacity, ducts, curb/pad, condensate, controls and current code/incentive requirements must be evaluated.

Yes. A ductless heat pump can be a practical option for a specific space when extending or correcting the central duct system is not attractive. The room load and indoor/outdoor-unit placement still need design.

Many ductless systems offer a dry/dehumidification mode, but operation varies by model. It usually removes moisture while providing some cooling; use the manufacturer instructions for that specific unit.

Indoor mini-splits recirculate room air through filters and a compact coil/blower assembly. Fine dust and moisture can accumulate over time even when filters are cleaned, so deeper cleaning may occasionally be needed.

A whole-house fan can cool a home with outdoor air when outside temperatures are favorable, but it is not a substitute for AC during hot or smoky conditions and requires adequate attic exhaust/open windows.

A whole-house fan intentionally moves outdoor air through the living space and into the attic, while an attic fan primarily ventilates the attic. Their purpose and installation requirements are different.

Maybe, but an addition changes building load and may not have adequate duct capacity. The new space should be included in a load and airflow evaluation before tying it to the existing system.

Possibly, but load, duct capacity, return-air path, code and how the space was permitted must be evaluated. A ductless system may be another option.

Long duct runs, building separation, code and independent occupancy can make extension impractical. A dedicated ductless heat pump is often considered, but the specific load and electrical supply still matter.

Yes in some homes if the load and duct distribution are well designed, but two-story homes are more sensitive to solar gain, stack effect and airflow balance. Zoning is one option, not an automatic requirement.

Check whether the room has adequate supply airflow and a return-air path when the door is closed. Pressure imbalance, duct restriction and room load are common reasons the problem appears only with the door shut.

Closed doors can restrict the path back to central returns, changing room pressure and delivered airflow. Transfer grilles, jump ducts or dedicated returns may be used when design requires a better return path.

Yes. Restricted outdoor heat transfer can increase compressor workload and operating pressure. Heavy debris should be removed with cleaning methods that do not damage the coil.

Repeated exposure can corrode aluminum/copper surfaces and cabinet components. Keep pets from urinating on the equipment and rinse/inspect corrosion according to safe maintenance guidance.

Repeated mineral-rich spray or constant wetting can contribute to corrosion and coil deposits. Adjust sprinklers so they do not regularly spray the condenser/heat pump.

Sound can come from the equipment design, mounting, refrigerant piping, cabinet panels or nearby reflective surfaces. New abnormal vibration should be checked rather than assumed to be normal.

Start with the complete equipment model number from the rating plate. Parts can change by product series and production run, so match the equipment model first and then confirm any original component number before ordering.

The model number is usually the primary key for parts lookup. The serial number can help confirm manufacturing date or production variation when the model alone is not enough.

The rating plate is normally on the outdoor cabinet, often near the service-valve or electrical-access area. Photograph the entire label so Heco can see the model, serial and electrical/refrigerant information together.