Overview
- Retail pressure this week has changed short‑term choices, with Lidl sharply discounting a Comfee monoblock and a Midea PortaSplit mobile‑split unit, making the split option cheaper for many renters and small rooms.
- Regulators and testers advise against routine use of monoblocks because their single‑hose design creates underpressure that draws warm outside air in, lowers real cooling performance and raises electricity use.
- Split systems, including mobile‑split models with a small outdoor unit, are markedly more efficient and quieter but typically cost more and often require certified installers for work on refrigerant lines under EU F‑gas rules.
- Whether a split pays off depends on hours of use and electricity price: published examples show modest annual savings that can take many years to recoup the higher purchase cost if the unit is used only on a few hot days.
- Innovators are offering alternatives while health guidance warns care with low‑cost options: Austria’s so.cool is taking preorders for a plug‑and‑play TerraBreeze prototype that stores heat in phase‑change materials, and researchers report fans can increase heat strain if users are dehydrated.