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AC in a renovated (insulated) series building: drill once, drill right
In a renovated series building the AC conversation changes: 10–15 cm of external insulation means brackets need extended anchors reaching the load-bearing wall, every penetration must be sealed to protect the insulation layer, and the manager will require approval because careless drilling can void the facade renovation's warranty. The reward is the best insulation of any series building — the same room needs a smaller unit than before renovation.
Key takeaways
- The facade is no longer just a wall — it's an insulation system under warranty. That's why renovated buildings have the strictest manager approval of any series type.
- Brackets must anchor through the insulation into the load-bearing wall — extended anchors or thermal-break mounting systems, never fasteners that grip only render and EPS.
- Every penetration (bracket points, line hole) must be sealed so no moisture enters the insulation layer — a wet insulation layer is the failure mode everyone is guarding against.
- The upside is real: post-renovation insulation is the best in the series stock, so the calculator's 'renovated' defaults produce the smallest unit class for a given room.
- Expect a slightly costlier mount (longer anchors, careful sealing, sometimes manager-mandated details) — it's the correct price for not owning a facade-warranty dispute.
What changed when the building was renovated
A renovated series building — whether it started as a 602, 119, hrushchevka or 103 — gained an external insulation system: typically 10–15 cm of mineral wool or EPS under render, often new windows and glazed loggias with it. For an AC installation this changes three things at once:
| Factor | Renovated series building |
|---|---|
| Wall structure | Original load-bearing wall + insulation + render — brackets must reach the structural layer |
| Drilling difficulty | Hard — not the drilling itself, but doing it without compromising the system |
| Manager approval | Strictest of any building type — the facade system carries a warranty |
| Insulation | Best in the series stock → smaller unit for the same room |
| Typical ceiling | As the original series (~2.5 m for most) |
| Condensate | Must not run onto the fresh render — routed drainage, no exceptions |
Mounting: through, not into
The rule that decides everything: the insulation layer is not a structural material. A bracket anchored into render and EPS will loosen under vibration and let water in. Correct practice:
- Extended anchors through the insulation into the original panel or brick wall, or dedicated stand-off mounting systems with thermal breaks (these also avoid creating a cold bridge at each bolt).
- Sealed penetrations — bracket bolts and the refrigerant-line hole get sealed so moisture cannot migrate into the insulation. A wet insulation layer loses its function invisibly and expensively; this is what the manager’s requirements are protecting.
- Slope and sleeve for the line penetration, same as everywhere — see the condensate guide for the water side.
If a candidate installer can’t describe this unprompted, that answers the selection question — the quote checklist questions work especially well on this building type.
Approval: the warranty is the reason
Facade renovations are typically co-financed projects with a warranty on the facade system, and an unauthorised penetration can jeopardise it for the whole community. So expect the manager to require: prior approval, the mounting detail specified, sealing method named, and sometimes a preferred placement (loggia side, defined zones). This is the building type where the manager conversation is genuinely non-negotiable — and where having it early converts into a smooth installation.
Loggia and balcony placements deserve first consideration here: minimal facade impact, easy service access, and managers approve them fastest.
The upside: smaller unit, better performance
Renovation moves the building’s insulation from the era’s worst to the stock’s best. In sizing terms that is one whole factor: the calculator applies good-insulation defaults for renovated buildings, and the same 18 m² room that needed 2.5 kW unrenovated often sizes at 2.0 kW after. Smaller unit, quieter operation, less electricity — the one series type where the building works with you.
Print it: the Riga building series cheat sheet puts every documented series — walls, drilling, typical unit size, approval quirks — on one printable page.
Frequently asked questions
Can the outdoor unit hang on the insulated facade at all?
Yes — with mounting designed for it: extended anchors that pass through the insulation and grip the structural wall, or stand-off systems with thermal breaks. What's forbidden is anchoring into the render/EPS itself; it will not hold the unit's weight and vibration, and it breaches the insulation.
Why is the manager so strict about renovated facades?
The renovation is typically a co-financed project with a warranty on the facade system. An unauthorised penetration that lets moisture into the insulation can void warranty coverage for the whole building — so managers require approval, specified mounting details and proper sealing. It's the one building type where 'ask forgiveness' can cost the community real money.
Does the renovation change what size AC I need?
Yes, downward. Insulation is the biggest single factor after room size: select 'renovated series building' in the calculator and the good-insulation default typically lands the same room one step lower than its unrenovated neighbour.
Are there alternatives to facade mounting here?
Often yes, and managers like them: loggia/balcony placement (no facade penetration except a short line run), or ground placement for first floors. If your renovation glazed the loggias, a unit inside the loggia with louvered airflow can work — confirm the manager's position and the unit's ventilation needs.
Who should do the drilling?
An installer who can name the mounting system for insulated facades before you ask. This building type is the strongest argument for the competence questions in our quote guide — ask specifically how they anchor and seal on an ETICS/insulated facade.