MODEL UNDER WAY! Welcome to Harmony. A serene 166-acre master-planned community developed by Hillwood Communities in Red Oak, Texas. Harmony offers a picturesque setting of parks, open spaces and wooded trails close to two-top ranked Red Oak schools. Harmony, a beautiful place to call home, at prices you can live with. - Swimming Pool & Cabana - Playground - Wooded Trails - Parks & Greenbelts