Key Details on Air Conditioners That Don't Require Outdoor Units
Outdoor units are not always possible in Bulgarian apartments, heritage buildings, or rentals with façade restrictions. Fortunately, several cooling options can work without an external condenser, including through-the-wall monoblock systems and portable units. Understanding how these systems remove heat, what installation they need, and what they typically cost helps you choose a setup that fits your room size and building limits.
Many homes in Bulgaria face practical limits on installing an external condenser on a façade or balcony. In these situations, “no outdoor unit” cooling usually means either a monoblock system that vents through the wall or a portable unit that exhausts through a window opening. Each approach can be effective, but performance, noise, aesthetics, and running costs differ more than many buyers expect.
Cost of Air Conditioners Without Outdoor Units
Air conditioners without outdoor units fall into two common categories. The first is a fixed monoblock unit (often installed through an exterior wall) that contains the compressor and heat exchanger indoors and uses two wall penetrations to move air in and out. The second is a portable unit on wheels that exhausts hot air via a hose to a window kit. Both avoid an external condenser, but they also concentrate more noise inside the room because the compressor is indoors.
In real-world budgeting, the main cost drivers are cooling capacity (kW/BTU), energy efficiency (seasonal ratings and inverter control where available), and installation complexity. Monoblock wall systems typically cost more up front, but can look cleaner and may be easier to permit in buildings that prohibit visible outdoor units. Portable units are usually cheaper initially, but they tend to be less efficient in practice, especially single-hose models that can draw warm air into the room.
Prices for Portable Air Conditioners Without Ducts
Portable air conditioners are often advertised as “without ducts,” but most still need an exhaust hose to a window or a sliding-door panel to expel heat. What they usually mean is “no permanent ducting” and no fixed outdoor unit. When comparing models, pay attention to the type (single-hose vs dual-hose), noise rating (dB), dehumidification performance, and whether the unit can realistically cool your room size during hot afternoons.
For Bulgarian apartments, portability is a genuine advantage: you can cool a bedroom at night and move the unit to a living room during the day. The trade-offs are the window opening needed for the hose, warm air infiltration with single-hose designs, and higher operating noise. If the room has strong sun exposure, older windows, or poor insulation, a portable unit may need to run longer to maintain temperature, which affects electricity consumption.
Below is a pricing-oriented snapshot of common “no outdoor unit” options and a well-known split-system reference model people often ask about when evaluating alternatives.
| Product/Service | Provider | Cost Estimation |
|---|---|---|
| Through-the-wall monoblock (e.g., Unico series) | Olimpia Splendid | Approx. 2,200–4,000 BGN (unit + typical installation varies) |
| Through-the-wall monoblock (e.g., 2.0/monoblock lines) | Innova | Approx. 2,000–3,800 BGN (unit + typical installation varies) |
| Portable unit with exhaust hose | De’Longhi (Pinguino range) | Approx. 700–1,800 BGN depending on capacity and features |
| Portable unit with exhaust hose | Whirlpool | Approx. 600–1,500 BGN depending on capacity and availability |
| Wall-mounted split reference (requires outdoor unit) | Daikin (Emura models) | Approx. 3,000–7,000 BGN (system + typical installation varies) |
Prices, rates, or cost estimates mentioned in this article are based on the latest available information but may change over time. Independent research is advised before making financial decisions.
Price of Daikin Emura Models
Daikin Emura models are frequently discussed because they are designed for interiors where appearance matters, but they are not “without outdoor unit” systems. They are wall-mounted split air conditioners that require an external condenser. If your building rules allow an outdoor unit (or if it can be placed on a balcony in line with local requirements), Emura can be relevant as a premium, design-oriented option to compare against monoblock and portable solutions.
If you cannot install any outdoor hardware at all, it helps to use Emura pricing as a benchmark rather than a direct option. In many cases, a high-quality monoblock wall system can approach split-system pricing once installation and wall work are included. The key question becomes what you are optimizing for: external appearance and permissions (favoring monoblock), flexibility and low upfront spending (favoring portable), or higher efficiency and lower indoor noise (often favoring split systems, where allowed).
A final practical point for Bulgaria is the building-specific constraint: façade rules, condominium decisions, and heritage restrictions can outweigh technical preferences. Before committing, check where wall penetrations are permitted, how condensate will be managed, and whether noise limits matter for your room placement. With the right sizing and expectations, “no outdoor unit” cooling can be a workable compromise, especially for smaller rooms and properties with strict exterior limitations.
