Most EPA guidelines recommend quarterly inspections and maintenance for ATUs. Monthly air diffuser checks are actually good practice since a clogged diffuser can cause system failure quickly. Your contractor’s recommendation sounds about right. The cost is usually $250-$500 per visit quarterly, so budget about $1,000-$2,000 per year for maintenance.
Most EPA guidelines recommend quarterly inspections and maintenance for ATUs. Monthly air diffuser checks are actually good practice since a clogged diffuser can cause system failure quickly. Your contractor’s recommendation sounds about right. The cost is usually $250-$500 per visit quarterly, so budget about $1,000-$2,000 per year for maintenance.