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Trade 08 of 13

Heating and cooling, how air moves through the house.

Comfort, noise and air quality all come from the system’s design. Ducts and equipment take space, so they are placed early.

In short

  • Right-sized equipment beats big equipment. Oversizing makes a house less comfortable, not more.
  • Ducts leak when they are poorly sealed. Testing them is part of doing it right.
  • Where the outdoor unit sits matters for noise, appearance and salt air.
Drawing: Heating, cooling and ventilation1234
  1. Air handlerThe fan and coil that heat or cool the air and push it around the house.
  2. Supply ductsCarry conditioned air to the registers in each room.
  3. Return airPulls house air back to the unit. Every room needs a path.
  4. ThermostatThe control. Where it sits affects how the house feels.
A house in section: an air handler in the attic sends supply air through ducts to registers, and return air comes back through a grille. A thermostat controls it.

What you will see

In the order it happens.

  • NoiseMedium
  • MessLight
  • Your sayMedium
  1. Step 1

    Equipment is delivered and set in the attic, closet or crawlspace and outdoors.

  2. Step 2

    Ducts run through framing, and openings for registers are cut.

  3. Step 3

    Refrigerant lines, water drains and controls are connected.

  4. Step 4

    At the end, the system is started, tested and balanced room to room.

How it is done well

The techniques that matter.

  • A load calculation (heat gained and lost, room by room) sizes the equipment.
  • Ducts are sealed, kept inside the conditioned space where possible, and tested.
  • Bath and kitchen fans exhaust to the outdoors, not into the attic.
  • Air has a way back from every closed room, so a shut door does not choke the airflow.

The hardest parts

Where this trade earns its fee.

  • Finding space for ducts in an existing house.
  • Quiet operation near bedrooms.
  • Keeping equipment reachable for service.

Think deeply here

Decide this before the trade starts.

These are the choices that decide whether the finished house matches the one in your head. Changing them later costs time and money.

  • System type: ducted, ductless or radiant, and heat pump or not.
  • Zones: which rooms need their own thermostat.
  • Where the equipment and the outdoor unit go, with noise in mind.
  • Register and grille styles and locations, since you will see them every day.

Ask any builder

  • Who did the load calculation?
  • Where does the outdoor unit sit, and how loud is it at the property line?
  • Will the ducts be tested for leakage?
Before thisElectricalNext on siteInsulation

All the trades, in the order you will meet them

  1. 01Site work
  2. 02Foundations
  3. 03Framing
  4. 04Roofing
  5. 05Windows and exterior
  6. 06Plumbing
  7. 07Electrical
  8. 08HVAC
  9. 09Insulation
  10. 10Drywall and plaster
  11. 11Tile
  12. 12Cabinetry
  13. 13Floors and paint

General guidance, not a specification. Your drawings, your engineer and your building inspector govern every job. See the whole process · Trade secrets home

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  3. Then nothing, unless you askNo follow-up sequence, no call from anyone else. The assessment is yours to keep, and to take anywhere.

Updated October 2026

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