Colleen Neel discovered an alternative to PTHPS. They are from Italy and currently seeking an AHRI certificate later this year. She wanted to ensure this opportunity was known and something that could be potentially implemented once the AHRI certificate is established. Please reach out to Colleen with any questions. Olimpia Splendid Maestro Pro Inverter 12 HP: https://www.olimpiasplendidusa.com/air-conditioner-without-outdoor-unit/maestro-pro-inverter-12-hp Innova HPAC 2.0: https://innova-usa.com/hpac-2-0/.