615 HVAC Questions, Answered Clearly

A gas-to-electric heat-pump conversion can take longer than a like-for-like changeout because it may involve electrical work, air-handler changes, refrigerant piping, gas-line retirement and code verification.

A typical replacement includes protecting the work area, removing old equipment, installing the approved components, connecting refrigerant/electrical/drain/duct interfaces, startup testing and a customer walkthrough. The exact scope should be written before work begins.

It should be stated explicitly in the written scope. Heco's quote should identify removal/disposal, new equipment, labor, permits, testing and any excluded duct/electrical work rather than leaving those items assumed.

This is quote-specific. Heco should clearly show whether permit fees are included, estimated separately or customer-paid; the advisor should read the actual proposal rather than assume.

If the project requires HERS or other field verification, the proposal should state who arranges and pays for it. The requirement and cost can vary by project and jurisdiction.

Not automatically. Thermostat replacement depends on system compatibility, controls and the approved scope; the proposal should identify whether the existing control is reused or replaced.

Sometimes, but the furnace blower, indoor coil, controls, refrigerant compatibility and overall match should be evaluated. A partial replacement should still produce an approved matched system and required airflow.

Sometimes, but the new furnace must work with the existing indoor coil, blower/airflow needs, controls and venting. The equipment combination should be checked before assuming reuse is appropriate.

No. 'HVAC replacement' can mean different scopes depending on whether the home has a furnace/AC split, heat pump, packaged unit or other configuration. The proposal should name every component being replaced.

Often the indoor coil is part of the matched rated system. Reusing an old coil can create refrigerant, capacity, efficiency or compatibility problems, so the equipment match should be verified before deciding.

A matched system uses indoor and outdoor components that are tested or approved to operate together at specified capacity and efficiency. The exact combination matters more than simply matching brand names.

An AHRI certificate documents a tested combination of HVAC components and its rated performance. It can be useful for confirming matched efficiency and may be needed for incentive or code documentation.

Sometimes, if size, condition, cleanliness, routing and refrigerant/manufacturer requirements allow it. A replacement proposal should state whether the line set will be reused, cleaned, resized or replaced.

Replacement may be appropriate when the line is damaged, leaking, incorrectly sized, inaccessible to clean, contaminated or incompatible with the new equipment requirements.

Manufacturer procedures determine whether existing piping can be reused and what cleaning/preparation is required. This is not a one-rule-for-all-systems decision.

It may. Electrical requirements depend on the outdoor unit, air handler, auxiliary heat and existing service. Heco should compare equipment nameplate requirements with the home's electrical capacity before finalizing the design.

Not always. A load calculation on the electrical service should determine whether new HVAC circuits can be added safely or whether panel/service changes are needed.

The approved scope should address safe disconnection/capping of the gas branch serving removed equipment, subject to code and permit requirements. The customer should know whether gas remains for other appliances.

Not automatically. The existing ducts should be evaluated for required airflow, leakage and capacity; a heat-pump conversion can work with existing ducts when they are suitable.

Possibly, if it provides stable support, drainage, clearances and the dimensions required by the new unit and code. Replacement or extension may be needed for a different footprint.

Newer equipment can have different cabinet dimensions because of coil area, efficiency and design. Placement should be checked for service clearances, property constraints and airflow before ordering.

The location needs adequate airflow, service clearance, stable support and compliance with manufacturer and local requirements. Noise, drainage, property-line and access considerations can also matter.

Only if manufacturer airflow and service-clearance requirements can be met. Restricted discharge or recirculation can reduce capacity and damage equipment.

It should. A quality startup verifies controls, airflow and system operation after installation rather than assuming new equipment is performing correctly out of the box.

The homeowner should understand thermostat operation, filter location/type, normal system behavior, basic maintenance, warranty/registration steps and who to contact if a problem appears.

That depends on scope and complexity. A project-specific installation plan should explain expected downtime, especially when weather is extreme or the job spans more than one day.

Some work can proceed, but weather can affect roof access, refrigerant commissioning, electrical safety and crew conditions. Heco should make a safety-based project decision rather than promise completion regardless of conditions.