ThermoSmart® Versus Conventional Humidification in Continuous Positive Airway Pressure (CPAP)

Inclusion Criteria: 1. ≥ 18 years of age 2. Previous diagnosis of OSA permitted, but patient must be novel to CPAP and no previous surgical intervention for OSA or treatment with an oral appliance. 3. AHI ≥ 15 OR AHI ≥ 5 + ESS ≥ 10 OR ESS ≥ 10 + a medical co-morbidity 4. Patient willing to give informed consent and follow study protocol. Exclusion Criteria: 1. Wake resting SpO2 \< 90% 2. Patient requires BiLevel PAP or supplemental oxygen 3. The patient is medically unstable (e.g. respiratory or cardiac failure) 4. Patient unwilling to give informed consent or follow study protocol.