```ts
export function runThermostat(start: number, low: number, high: number, power: number, drifts: number[]): { temp: number; heated: number; switches: number; coldest: number } {
  if (!Number.isInteger(start) || !Number.isInteger(low) || !Number.isInteger(high) || !Number.isInteger(power)) {
    throw new Error("Invalid temperature or power value");
  }
  if (low >= high) {
    throw new Error("Low must be strictly below high");
  }
  if (!Array.isArray(drifts) ||!drifts.every(Number.isInteger)) {
    throw new Error("Drifts must be an array of integers");
  }

  let temp = start;
  let heated = 0;
  let switches = 0;
  let coldest = start;

  for (let drift of drifts) {
    if (temp < low) {
      heated++;
      switches++;
      temp += power + drift;
      coldest = Math.min(coldest, temp);
    } else if (temp >= high) {
      heated++;
      switches++;
      temp += drift;
      coldest = Math.min(coldest, temp);
    } else {
      heated--;
      temp += drift;
    }
  }

  return { temp, heated, switches, coldest };
}
```