Ducted air conditioning in a Spanish renovation: plan the ceiling first

Test finished ceiling levels, not a generic allowance

Spain's RITE applies to the reformed portion of fixed thermal installations in existing buildings. Its access, insulation, cleaning, maintenance and checking requirements must be resolved for each project; it gives no universal false-ceiling drop.

Map slabs, beams, downstands, columns, pipes, ventilation, lighting, curtains, cabinets, doors and room transitions. Record finished heights by zone. A corridor route or limited bulkhead may be studied, but it is not guaranteed before obstacles are checked.

Source: BOE · RITE: ámbito y reformas de instalaciones térmicas

Draw the unit, ductwork and terminals as one route

Place the indoor unit with space for removal and maintenance. Show the route to the outdoor unit, refrigerant pipework, electrical services and crossings. Do not assume that façade, roof or shared-element questions are resolved; the competent team should identify building conditions and applicable procedures.

Draw supply and return separately, including insulation and changes in direction. RITE supports access for cleaning and maintenance and inspection panels in suspended ceilings where needed. Decide their positions before boarding: an access hatch blocked by a cabinet or light is not useful.

Coordinate the drawing with the false-ceiling lighting plan and place decisions in the renovation sequence. Moving a downlight at the end may not solve a clash between a duct, ceiling frame and service hatch.

Source: BOE · RITE: ámbito y reformas de instalaciones térmicas

Review supply and return together

Ask which rooms receive supply air, where diffusers or grilles sit and how air returns to the unit. Closed doors, corridors and furniture can affect the intended path. Do not rely on a generic airflow or duct-size rule; ask the design team to justify the arrangement for the property.

Check terminals against beds, sofas, curtains, wardrobes, lights and doors. The applicable DB HR framework must be resolved for the project: ask how noise and vibration will be handled at the unit, supports, ducts, grilles and adjoining spaces, without using one universal room dB target. The soundproofing guide helps frame questions but does not design the system.

Resolve condensate and servicing before plasterboard

Condensate needs a confirmed destination, a route that works with the available levels and a serviceable arrangement. If a pump is proposed, ask why it is needed, where it will sit, how it can be reached and what happens if it stops. A pump is not the default cure for an unresolved route.

RITE requires duct insulation to limit losses and prevent condensation, and supports relevant checks before ducts become inaccessible. Agree checks, records and timing. Coordinate supplies, protection and controls with the home's electrical renovation. Electrical, refrigerant and drainage connections are professional work, not a homeowner adjustment.

Source: BOE · RITE: ámbito y reformas de instalaciones térmicas

Keep comfort conditioning separate from ventilation

A ducted system that recirculates air for heating or cooling does not by itself replace dwelling ventilation. The CTE DB HS indoor-air strategy is a separate design question. Ask the project team to coordinate both systems and determine how existing-building provisions apply to the intervention.

Identify bathroom and kitchen extraction, air inlets, shared ducts and any whole-home ventilation proposal. Do not join them merely because the routes are close. For an internal bathroom, use the separate windowless-bathroom ventilation checklist. Add acoustic, fire, structural and shared-element interfaces that the competent team considers applicable.

Source: CTE · DB HS 3, calidad del aire interior, apartado 3.1.1

Normalise assumptions before comparing totals

Consider a hypothetical pair of offers. Offer A lists an equipment model and one ceiling allowance but omits the return route, access panels, drain, ceiling restoration and commissioning. Offer B includes a coordinated plan with varying ceiling zones. B is not automatically correct or better value; first require both to state the same known obstacles, scope and exclusions.

Carry the work into the whole-flat renovation budget. The quote comparison tool and guide to comparing renovation offers in Spain can align written items, but neither validates a route or system capacity.

Receive an installation that can be found and maintained

Before the ceiling closes, agree the relevant duct, insulation, drainage and operational checks and who keeps the results. At handover, identify the actual unit and controls, filters, grilles, access panels and installed routes. Request a demonstration plus use, cleaning and maintenance instructions.

Keep manuals, product references and an as-built plan showing changes. This is procurement guidance: the project team decides which records, certificates or registrations apply to the intervention, municipality and autonomous community. An illuminated controller alone does not show that return air, drainage, access and finishes are complete.

Source: BOE · RITE: ámbito y reformas de instalaciones térmicas