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Pröll is seen as a supporter of a Grand Coalition between the ÖVP and Social Democratic Party (SPÖ). In the year 2000 he was still a supporter of the "black-blue" coalition (ÖVP with the Freedom Party (FPÖ)), but two years later argued against such an arrangement. Pröll also has a good relationship with Viennese mayor Michael Häupl (SPÖ).
Great interest was aroused in Europe when he proposed a tax on mobile phone masts in the state of Lower Austria. Together with the SPÖ he suggested legally regulating mobile phone transmitters, with the aim of reducing the overall number. At the same time the state planned to set up a local telecommunications infrastructure by means of a Wireless LAN.
After an agreement with the mobile radio companies, the taxation was not realized. The agreement in fact was used as an example for other regions.
Pröll is married with four children. He is the uncle of Josef Pröll, former Austrian Vice Chancellor and Minister of Finance.
The magazine Falter in 2002 reported the response by regional party secretary Ernst Strasser to criticism of Pröll's confession that he had only ever managed to finish one book, Karl May's cowboy novel Der Schatz im Silbersee (The Treasure of Silver Lake): "People like that, at least it shows the governor isn't a know-all."
In September 2014, in an interview with the newspaper Kurier, he denied any interest in being a candidate for the Presidential election due in 2016, saying the idea left him cold: "My life plan is different". Reports in April 2015, however, suggested that he had sounded out the idea with his staff.
- Gerald John and Nina Weissensteiner, "Hohe Stirn, flaches Land", Falter, 28 August 2002