The heat does not negotiate. When your cabin air-con stops blowing cold the fix is sometimes a simple refrigerant top-up — and sometimes a leaking condenser hidden behind the front bumper. We diagnose with proper gauges and a UV leak detector before quoting anything beyond a recharge.
The phrase "must be electrical" usually means the previous workshop gave up. We do not. With a proper scope, a load tester and time on the floor, most intermittent faults can be traced — and the price is almost always lower than replacing the wrong part.